INVITED PRESENTATIONS

2005

• Invited Speaker, " Mathematical Models and Their Application to the Spread and Control of Tuberculosis,” Mathematical and Statistical Modelling of Infectious Diseases-New Trends and Developments, February 11, 2005.
• Invited Speaker, " Mathematical Model Applications to Disease and Homeland Security” Mathematical and Statistical Modelling of Infectious Diseases-New Trends and Developments, February 10, 2005
• Invited Speaker, "Modelos Epidemiológicos” Primer Curso Centroámericano de Modelación Matemática, Nacional University, San Salvador, El Salvador, January 21, 05.
• Invited Speaker, "Modelos Epidemiológicos y la Tuberculosis” Primer Curso Centroámericano de Modelación Matemática, Nacional University, San Salvador, El Salvador, January 21, 05.
• Workshop Speaker, "Problems in Epidemiology,” SAMSI Workshop of Modeling Infectious Diseases, SAMSI, North Carolina, January 31-February 1, 2005.
• Dr. Marjorie Lee Brown Colloquium (http://www.math.lsa.umich.edu/mlk/index.html), The Colloquium honors  Dr. Marjorie Lee Browne, the first African-American woman to earn the Ph.D. in Mathematics from the University of Michigan. January 17, 2005
•   Invited Speaker, "Collaborative Learning with Students' Driven Research Agenda: the case of the Mathematical and Theoretical Biology Institute," NRC institute on integrating quantitative and life sciences for NIH minority program, January 10, Santa Cruz, CA

2004

• Applied Mathematics Seminar Speaker, “Epidemiological Mathematical Modeling Applications in Homeland Security,”Department of Mathematics, PurdueUniversity, Lafayette, IN October 29, 2004.
• IGERT Seminar Speaker, “Models for the Spread and Control of Tuberculosis, IGERT Applied Mathematics Seimnar, University of Arizona, Tucson, AZ, September 21, 04
• Hispanic Heritage Month Key Note Speaker, The National Institutes of Health Hispanic Employee Organization (NIH-HEO) (http://videocast.nih.gov/PastEvents.asp) 2004 Hispanic Heritage Month Celebration: Part 1; September 15, 2004.
• Special Seminar Speaker, “Modelos Matemáticos en la Salud y Seguridad Pública,” Universidad de Baja California, Baja California, México, August 20, 2004.
• LSAMP Speaker, Worshop for WAESO LSAMP fellows, Arizona State University, Tempe, AZ, July 30, 2004 (CD Available).
• Special Workshop Speaker, “How to build the discipline and passion to get into and complete a graduate program.” AGEP Workshop, University of New Mexico, Albuquerque, NM, July 26, 04.
• Panelist Speaker, SIAM Annual Meeting, Professional Development Evening. Panel 1: Writing and Submitting a Paper, Portland Oregon, July 15, 2004.
• Special Session Speaker, “An Epidemic Model with Virtual Mass Transportation” SIAM Annual Meeting, Special Session, Dynamics of Social Networks Part 1, Portland Oregon, July 14, 2004.
• Special Session Speaker, “Modeling the Spread of Disease on Dynamic Networks” SIAM Annual Meeting, Special Session, Dynamics of Social Networks Part 2, Portland Oregon, July 15, 2004.
• Workshop Speaker, “Introduction to MTBI/SFI Workshop in Complexity Theory,” SFI Institute, Santa Fe NM, July 7, 2004.
• Invited Lecturer, “Mixing and Epidemiology 1” MITACS/PIMS Special Program on Infectious Diseases June 19 - July 2, 2004 at the Banff International Research Station in Banff, Alberta, June 25, 2004.
• Invited Lecturer, “Two epidemiological Examples with Complex Mixing”MITACS/PIMS Special Program on Infectious Diseases June 19 - July 2, 2004 at the Banff International Research Station in Banff, Alberta, June 26, 2004.
• Special Seminar Speaker, Shanghai Jiatong University, China, May 10-24, 2004. “Models for the spread and evolution of Influenza.”
• Special Seminar Speaker, Xl’an Jiaotong University, China, May 10-24, 2004. “Models for the spread of tuberculosis.”
• Special Seminar Speaker, Xl’an Jiaotong University, China, May 10-24, 2004. “Models for the spread and evolution of Influenza.”
• Special Seminar Speaker, Xl’an Jiaotong University, China, May 10-24, 2004. “Models for the natural and deliberate spread of biological agents: the case of SARS and smallpox.”
• Key Note Speaker, “Building and Linking Communities through Mathematics: Adventures of a Mathematical Biologist”, NSF AGEP Aliance for Graduate Education and the ProfessoriateStony Brook University, April 30, 2004.
• Special Seminar Speaker, “Epidemiological Approaches to Questions in Homeland Security,”Estrella Mountain Community College, Phoenix, AZ, April 8, 2004.
• Special Speaker Hispanic Heritage Month, “The Possible Use of Mathematical Models in Homeland Security,” University of Arizona, April 22, 2004.
• Colloquium speaker, “Cross - immunity and influenza dynamics,” Mathematics Colloquium, University of Arizona, April 22, 2004.
• Colloquium speaker, “Use Of Epidemiological Models On Problems Associated With Homeland Security, Applied Mathematics Colloquium, University of Arizona, April 23, 04.
• SIAM Colloquium speaker, Problems at the Interface of Mathematics and Homeland Security, Dept. of Mathematics & Statistics, Texas Tech University, Lubbock, TX, April 14, 04.
• Speaker Mentoring Institute, “Why should you consider doctoral education and the professoriate?”MGE Fourth Mentorship Institute, ASU, Tempe, AZ, March 29, 04.
• Speaker Mentoring Institute, “Mentoring: Making a Difference,”MGE Fourth Mentorship Institute, ASU, Tempe, AZ, March 29, 04.
• Special Seminar Speaker, “Cross-Immunity as multiple strain viral co-existence: The case of influenza A,” Mathematical Biology Seminar, University of British Columbia, Vancouver, CA, March 17, 2004
• Special Seminar Speaker, “Epidemiological Approaches to Questions in Homeland Security,”San Diego State University, San Diego, CA March 7, 2004.
• Joaquin Bustoz Jr. Coomunity Lecture, “Building and Linking Communities Through Mathematics: from epidemics to collaborative learning to homeland security,” March 3, 2004, Arizona State University, Tempe, AZ, 2004.
• Colloquium speaker, “Epidemics on Attractors,” Mathematics Colloquium, Trinity College, San Antonio, TX, February 17, 2004.
• Special Session Speaker, “Mathematical Challenges and Opportunities in Homeland Security,” Special Session “Competitive and Adaptative Dynamics in Ecology,” AMS Annual Meeting, Phoenix Arizona, January 8, 2004.
• Seminar Speaker, “Models for Influenza with Cross-immunity,” Mathematical Biology Seminar, Arizona State University, Tempe, AZ, March 26, 2004.

2003

• Distinguished Visitor's Lecture Series, (http://www.math.uiowa.edu/colloq0304.htm) Department of Iowa, November 17-20, 2003 (3 lectures).
• Invited Speaker, Advanced Undergraduate Honors Seminar, “Cooperative Behavior and Peer Pressure: what do the dynamics of drug use, collaborative behavior and and fanaticism have in common?” University of New Mexico, March 26, 2003.
• Colloquium speaker, “Tuberculosis: Past, Current and Future Trends, ”Joint Math&Stats and Center for Advanced Studies Colloquium, University of New Mexico, March 27, 2003.
• Invited Speaker, “Questions and models associated with the deliberate release of biological agents and their consequences,”Joint Burroughs Wellcome Fund/Program in Applied and Computational Mathematics seminar at Princeton University, April 21, 03.
• Selected Presenter, “A Simple Model of Toronto's SARS Outbreak,” Workshop on Modeling Social Responses to Bioterrorism Involving Infectious Agents,” DIMACS, Rutgers University, May 29-30, 2003.
• Invited Visitor/Speaker, “El uso de modelos epidemiologicos en el estudio de la propagacion de enfermedades y drogas,” Universidad De Granada, Granada, Spain, May 4-9, 2003.
• Invited Presenter, "Models and Fanatic Behavior,” In Workshop: “How Complex Adaptive Systems Dynamics Can Be Related to Understanding and Modeling Terrorist Behavior," Santa Fe Institute, April 10-11, 2003.
• Invited Speaker, “The use of epidemiological approaches in the study of the deliberate release of biological agents and their consequences, " Advanced Concepts Group, Sandia National Laboratory, Albuquerque, NM, May 16, 03.
• Key Note Speaker, “Beyond means, numbers and proofs: the role of mathematics and statistics in the empowerment of our nation.” Math&Stats Graduation, University of New Mexico, May 16, 03.
• Invited Speaker, “Challenges and opportunities posed by emergent and re-emergent diseases: the role of theoretical, modeling and computational approaches,” NIEH Workshop on  “Computational System Biology,” MCNC, Research Triangle, North Carolina, October 8-10, 2003.
• Keynote speaker, at the 2003 Institute on Teaching & Mentoring, The COMPACT for Faculty Diversity, Southern Regional Educational Board, Miami, Florida October 31, 2003.
• Invited Panelist, "The Role of Professional Societies in Student and Faculty Development," The COMPACT for Faculty Diversity, Southern Regional Educational Board, Miami, Florida, November 1, 2003.
• Invited Speaker on the subject of Hispanics in science and engineering Board on Higher Education and Workforce, The National Research Council, The National Academies, Washington, DC, November 13, 03.
• Plenary speaker, “Problems at the interface of epidemics and homeland security,” Harvey Mudd College Mathematical Biology, Claremont, California, on Saturday, November 8, 2003.

2002

• Invited Speaker, “The Use of Epidemiological Models on the Spread of Disease, Drugs and Addiction,” NIGMS 40th Annivers Symposium, at SACNAS Annual Confer, 9, 28-2002.
• Invited Speaker, “The Role of Public Transportation in the Spread of Tuberculosis,” Infectious Diseases Symposium (Other Than AIDS), XVI IEA World Congress of Epidemiology Montreal, Canada, August 18-22, 2002.
• Invited Lecturer, “Baisc Models for Tuberculosis,”,Summer School on BioMath, Centro Internacional de Matematica, Lisbon, Portugal, July 15-19, 2002
• Invited Lecturer, “Models for Tuberculosis with close and casual contacts,” Summer School on BioMath, Centro Internacional de Matematica, Lisbon, Portugal, July 15-19, 2002.
• Invited Speaker, “Cooperative Behavior and Peer Pressure:  the dynamics of ideologically driven groups,” Special Sessions on the Applications of Mathematics to the study of the Deliberate Release of Biological Agents and Related Topics, SIAM 50th Anniversary and 2002 Annual Meeting in Philadelphia, July 8 – 12, 2002.
• Invited Lecturer, “Epidemiological approaches in the study of the impact of peer pressure in sociological processes,” Summer School on BioMath, Centro Internacional de Matematica, Lisbon, Portugal, July 15-19, 2002
• Invited Lecturer, “Discrete Epidemic Models and Dispersal,” Summer School on BioMath, Centro Internacional de Matematica, Lisbon, Portugal, July 15-19, 2002
• Invited Speaker, Center for Discrete Mathematics and Theoretical Computer Science (DIMACS), International Conference on Computational and Mathematical Epidemiology, June 28, 2002 - July 2.
• Invited Lecturer, Workshop on Disease Modeling, Center for Discrete Mathematics and Theoretical Computer Science (DIMACS), June 24-27, 2002.
• Key Note Speaker, SIDIM 2002, Inter American University of Puerto Rico San German, Puerto Rico, (22 and 23 of February 2002)
• Luncheon Speaker, “Mathematics, Germs, Drugs and Disease,”The Fifth Annual University Conference Series, City College, NY, April 19-19, 2002.
• Invited Presenter, “Comments on Models and Bioterrorism,” at the Conference on modeling bioterrorism agents, held at The MITRE Corporation, The Hayes Building, MITRE 7525 Colshire Dr. McLean VA  22102 MARCH 12-13, 2002.
• Seminar Speaker, “Mathematics in the Science Curriculum and Undergraduate Research Opportunities at Cornell University,” Universidad Metropolitana, Rio Piedras, Puerto Rico, February 25, 2002.
• Seminar Speaker, “Models for Collaborative Learning, Drug use and the spread of ideologies.” Department of Mathematics, University of Iowa, April 6, 2002.
• Seminar Speaker, “Germs, Drugs, Disease and Policy,” Universidad de Colima, January 2002.

2001

• Invited Speaker, “Mathematical and Theoretical Biology Institute,” The National Human Genome Research Grantee Workshop, Bethesda, MD, Nov. 28, 2001 (NHGRI, NIH).
• Invited Presentation, “Epidemiological Approaches in the study of peer-driven behavior,” NIAAA. National Institutes of Health, Bethesda, MD, October 11, 2001.
• Vigre Interdisciplinary Colloquium Speaker, “Mathematics and Tuberculosis,” Mathematics Department, Cornell University, October 2001.
• Invited Speaker, "Tuberculosis models with fast and slow dynamics: The role of close and casual contacts," Conference to honor the life and work of John Jacquez, University of Michigan, October 19-21, 2001.
• Keynote Speaker, "Mathematics, Germs, Drugs, Disease, Globalization, and Politics," SACNAS National Conference, Sept. 29, 2001, Phoenix, AZ.
• Mathematical Biology Seminar Speaker, “Role of Peer Pressure on Social Communities,” Department of Mathematics, Arizona State University, Sept. 28, 2001.
• Keynote Speaker, “Tradition and Culture: The Key to Survival and Good Science,” NM-AGEP Conference Program in Transitions in the Opportunities and Challenges of Diversity in Higher Education, New Mexico State University, Las Cruces, NM, Sept. 12, 2001.
• Seminar in Computational Biology Speaker, “Mathematical Models in Ecology and Epidemiology,” UCLA, May 30, 2001.
• Plenary Speaker, “Mathematical Models for Tuberculosis and Connections to Data,” The Fifth Mississippi State Conference will be hosted by Mississippi State University, May 18-19, 2001.
• Special Session Speaker, “Nonlinear Discrete-Time Pair Formation Models, Special Session, “Asymptotic Behavior of Difference Equations with Applications, annual meeting of the American Mathematical Society, New Orleans, Louisiana, January 10 - 13, 2001.
• Seminar Speaker, “Mathematics Models for Tuberculosis and Connections to Data,” Mathematics Department, Howard University, Washington, DC (4/1/01)
• Stoll Lectures Speaker, Department of Mathematics, University of Akron, Akron Ohio. Six Lectures in Mathematical Epidemiology, March 28-31, 2001.
• Invited Speaker, “REU Research in the biological and Natural Sciences at MTBI," Arizona State University, May 7, 2001.

2000

• Key Note Speaker, “Tradition: the Key to Survival,” Eleventh Undergraduate Research Symposium, Universidad Metropolitana, San Juan Puerto Rico, October 20-22, 2000.
• Special Session Invited Speaker, “Dispersal, Disease and Life-History Evolution,” Special Session, Nonlinear Differential Equations and Applications, American Mathematical Society, Birmingham, Alabama, November 10-12, 2000.
• Special Session Invited Speaker, “The role of behavior, mobility and public transportation on the spread of tuberculosis,” Special Session, Mathematical Problems in Epidemiology, 2000 SIAM, Annual Meeting, Puerto Rico, July 10-14, 2000.
• Invited Seminar Speaker, “Disease, Dispersal and Epidemic Models,” Colloquium, Mathematics Department, RPI, Troy New York, November 10, 2000.
• Invited Seminar Speaker, “Models for the transmission dynamics of Tuberculosis.” Department of Mathematics, National University of Ireland at Maynooth, June 8, 2000.
• Invited Seminar Speaker, “Dispersal, Epidemiology and Disease Evolution,” BUDS Seminar, Cornell University, Nov. 9, 2000

1999

• Pacific Institute for Mathematical Sciences Invited Lecturer, 1999-Summer School in Mathematical Biology,  “Cross-immunity and Coevolution in Epidemiology,” Vancouver, CA; 7-99.
• Pacific Institute for Mathematical Sciences Invited Lecturer, 1999-Summer School in Mathematical Biology, “Modeling Contact Structures in Biology and Their Application to the Dynamics of HIV Among Prostitution in Tijuana, Mexico,” Vancouver, CA; 7-99.
• Pacific Institute for Mathematical Sciences Invited Lecturer, 1999-Summer School in Mathematical Biology, “Potential Mechanisms for Disease Evolution: The Case of the Re-emergence of Tuberculosis,” Vancouver, CA; 7-99.
• Distinguished Lecturer, “Course in Mathematical Epidemiology,” three-month, 36-hour course for mathematics majors and high school mathematics teachers, Universidad de Tlaxcala, Apizaco, Tlaxcala, México, November 1998-January 1999.
• Invited Speaker, “The use of mathematical models to study the spread of epidemics.”  EHR-Division, NSF, May 10, 1999.
• Invited Speaker, “Public transportation and disease evolution,” the University of Michigan/Santa Fe Institute Conference on Complex Systems.  Ann Arbor, Michigan, Nov. 11-13, 1999.
• Invited Speaker, “Estructuras de Aparamiento y su importancia en la dinamica poblacional,”  Primer Minicongreso del Departamento de Métodos Matematicos y Numéricos, IIMAS, UNAM, México, Jnauray 22, 1999.
• Invited Class Lecture, “On epidemiology,” BioES 261 on Friday (8 Oct).
• Invited Seminar Speaker, “Potential mechanisms for the Re-emergence of Tuberculosis,” TAM, Cornell University, April 1999.
• Invited Seminar Speaker, "Changing Social Landscapes and Disease Evolution: the case of Tuberculosis," Regional Science Seminar Speaker Series. Joint speaker: Carlos Castillo-Garsow (Department of Biometrics, Cornell University), Cornel University, 12/1/ 99.

1998

• Mathematics Consortium’s 1998 Summer School Speaker, “Cross-immunity in Epidemiology, ” July 6-17, 1998, University of Wyoming, Laramie, WY.
• Mathematics Consortium’s 1998 Summer School Speaker, “The role of public transportation on the spread of communicable diseases, the case of Tuberculosis, ” July 6-17, 1998, University of Wyoming, Laramie, WY.
• Mathematics Consortium’s 1998 Summer School Speaker “Models for HIV Dynamics, ” July 6-17, 1998, University of Wyoming, Laramie, WY.
• Invited Lecturer, “Summer Course in Mathematical Biology”, 4-week research experience for undergraduates, Centro Intenacional de Ciencias, Cuernavaca, Morelos, México,  July 1998
• First Distinguished  Lecture Series Speaker, “Mathematical Models for the Spread of Tuberculosis,” Department of Mathematics, Memphis State University, March 27, 1998.
• Plenary Speaker, “The role of public transportation on the evolution of Tuberculosis,” Dynamical Roles of Feedback Circuits and Related Topics, Universidad Autonoma del Estado de Morelos, Cuernavaca, Morelos, November 30-December 4, 1998, México.
• Invited Speaker, “A model for mentoring faculty,” Encuentro de Investigacion y Docencia en Biologia Matematica, Universidad Autonoma Metropolitana-Iztapalapa, Mexico, April 15-17, 199
• Invited Special Session Speaker, “The role of public transportation on the spread of tuberculosis,” AAAS, Medicine and Public Health, Special Session  “The Mathematics of Epidemics and Disease”, January 22, 1998.
• Invited Special Session Speaker, “Retraining of Nurses by Peers,” II Congreso Panamericano de Infecciones Intrahospitalarias, April 21, 1998, Mar de Plata, Argentina.

1997

• Invited Seminar Speaker, “Mathematical Models in Epidemiology, two case studies: Tuberculosis im Buenos Aires and HIV/AIDS in Tijuana, Mexico,” Harvard School of Public Health, October 23, 1997.
• Invited Lecturer, Short course in Mathematical Models in Biology, Universidad de Caldas, Manizales, Colombia, (November 1997).
• Invited Speaker, “Programas de investigacion de pregrado para Estudiantes de origen latino y latioamericano en Biometria en Cornell,” Jornada de Investigacion y Primer Encuentro de la Red Mulis, Universidad Autonoma de Occidente, Cali, Colombia, September, 1997.
• Invited Speaker, “EL uso de los modelos matematicos en la epidemologia,” Jornada de Investigacion y Primer Encuentro de la Red Mulis, Universidad Autonoma de Occidente, Cali, Colombia, September 1997.
• Invited Lecturer, Short course in Mathematical Biology, Universidad del Valle, Cali, Colombia (November 1997).
• Invited Lecturer, Short course in Epidemiology: Eigth International Congress in Biomathematics.  ALAB, Panama City, Panama (August 1997).
• Plenary Talk, “Conceptos Basicos en Epidemiologia Teorica,”Octavo Congreso Internacional de Biomatematicas, Panama City, Panama, August 1997.
• Plenary Talk, “Modelos para la dinamica de la transmision de la tuberculosis,” Smithsonian Institute, Panama City, Panama, August 1997.
• Invited Lecturer, Short Course in Epidemiology, Jornada de Biomatematicas. Universidad del Quindio, Armenia, Colombia (May 1997).
• Invited Lecturer, “Topics in Mathematical Epidemiology” three-day course., Universidad Autonoma de Occidente, Cali, Colombia, May, 1997.
• Invited Talk, “Modelos matematicos para la dinamica de transmision del VIH en prostitutas en la ciudad de Tijuana,” Primer Seminario Estatal en Salud Publica, Colegio de la Frontera Norte and Universidad Ibero-Americana, Tijuana, Mexico, November 1997.
• Plenary Talk, “Tuberculosis,” Primer Seminario Estatal en Salud Publica, Colegio de la Frontera Norte and Universidad Ibero-Americana, Tijuana, Mexico, November 1997.
• Special Session Invited Speaker, “Modelos para la evolucion de Tuberculosis: el impacto del transporte publico,” XXX Congreso Nacional de la Sociedad Matemática Mexicana, Aguascalientes, México, September 28 – October 3 1997.
• Special Session Invited Speaker, “El uso de modelos matematicos en epidemiologia” V Encuentro Regional de Matematicas y X Evento Académico de Matematicas, Universidad del Cauca, Popayan, Colombia, Nov. 21, 1997.
• Special Session Invited Speaker, “Proyecto de formacion de Latnioamericanos en biomatematicas en Cornell” V Encuentro Regional de Matematicas y X Evento Academico de Matematicas, Universidad del Cauca, Popayan, Colombia, Nov. 21, 1997.
• Key Note Speaker, "Excellence in education building opportunities for our youth," Hispanic Heritage Month Unity Dinner, Latino Studies Program, Cornell University, Friday, Oct.24, 1997.
• Invited Lecturer, Short Course in Mathematical Epidemiology, Dept. of Mathematics and Statistics: Summer School of Mathematics, Universidad Nacional de Colombia and Universidad de Los Andes (July-August, 1997), Bogota, Colombia.
• Invited Seminar Speaker, "Transient relations and their effect on the selection of "Mr. or Ms. Right,” Department of Mathematics, University of Puerto Rico, Humacao, April, 1997.
• Invited Seminar Speaker, "Mathematical Models in Biology,” Department of Mathematics, University of Puerto Rico, Cayey, April 1997.
• Invited Seminar Speaker, “Is fate a factor in dating,” Biostatistics Laboratory, University of Texas, El Paso, TX, April, 1997.
• Invited Seminar Speaker, “Questions and Answers about Graduate School,” Club Zero, University of Texas, El Paso, TX, April, 1997.
• Invited Seminar Speaker, "Mathematical Models in Epidemiology,” Howard Hughes Program, University of Puerto Rico, Cayey, September 1997.
• Invited Seminar Speaker, “Mathematical Models in the Study and Control of Infectious Diseases,” Graduate School, Colegio de la Frontera Norte, Tijuana, México, March, 1997.
• Invited Seminar Speaker, “On Mathematical Ecology,” Graduate School, Colegio de la Frontera Norte, Tijuana, México, March 1997.
• Invited Lecturer, Short Course, Topics in Theoretical Epidemiology: the case of sexually transmitted diseases, Colegio de la Frontera Norte, Tijuana, Mexico (March 1997).
• Invited Seminar Speaker, “Mathematical Models in the Study and Control of Infectious Diseases--PART I.” Colegio de la Frontera Norte and Universidad Ibero-Americana, Tijuana, Mexico, March1997.
• Invited Seminar Speaker,  “Mathematical Models in the Study and Control of Infectious Diseases--PART I.I” Colegio de la Frontera Norte and Universidad Ibero-Americana, Tijuana, Mexico, March 1997.
•  Invited Seminar Speaker, “Mathematical Models in the Study and Control of Infectious Diseases--PART III.” Colegio de la Frontera Norte and Universidad Ibero-Americana, Tijuana, Mexico, March 1997.
• Invited Seminar Speaker, “Two case studies: HIV and Tuberculosis.” Colegio de la Frontera Norte and Universidad Ibero-Americana, Tijuana, Mexico, March  1997.
• Invited Seminar Speaker, “El papel del transporte publico y otros factores en la evolucion de enfermedades comunicables: El caso de la Tuberculosis y la Influenza,” Departamento de Matematicas, Universidad del Valle, Cali, Colombia, Noviembre 26, 1997.
• Invited Seminar Speaker, “La enzeñanza de los cursos de calculo en USA”, Departamento de Matematicas, Universidad del Valle, Cali, Colombia, Noviembre 25, 1997.
• Invited Seminar Speaker, "Transient relations and their effect on the selection of "Mr. or Ms. Right.”  Population and Development Program, Dept. of Rural Sociology, Cornell University, February 1997.

1996

• Distinguishecd Lecture Series, Profesor Suramericana, Suramericana de Seguros, Bogota, Colombia.(7/28-8/1/96).
• Invited Lecturer, "Mathematical Epidemiology," a one-week course.  Fourth Summer School, Dept. of Mathematics and Statistics, Universidad Nacional de Colombia, Bogota, Colombia, July 28-Aug. 1, 1996.
• Invited Lecturer, "Workshop on Coevolution with Applications to Epidemiology,"a two-week workshop for biologists, statisticians, and mathematicians.  Facultad de Ciencias, Universidad Autonoma de Mexico, May 1996.
• Plenary Talk, "Un estudio cualitativo comparativo de la importancia de los factores epidemiologicos and sociologicos en la dinamica de transmision del VIA (Virus de Inmunodeficiencia Adquirida).”  Primer Encuentro Puertoriqueno de Estadisticos, University of Puerto Rico, Rio Piedras, Puerto Rico, April 1996.
• Invited Seminar Speaker, "Social Dynamics and AIDS."  Dept. of Biostatistics, Case Western Reserve University, April 1996.
• Invited Seminar Speaker, “Pair formation models in demography and epidemiology.”  Department of Mathematics, Purdue University, West Lafayette, Indiana, 1996.
• Invited Seminar Speaker, “El uso de los modelos matematicos en epidemiologia,” Departamento de Matematicas, Universidad de Puerto Rico, Humacao, Puerto Rico, April, 1996.
• Invited Seminar Speaker, "The Social Spread of Disease: the Cases of HIV/AIDS and Tuberculosis in Mexico and Argentina," Latin American Studies Program Seminar Series, February 1996.
• Invited Seminar Speaker, “Did we catch Mr. or Ms. Right?”  Animal Breeding Seminar Series, Cornell University, October 1996.
• Invited Seminar Speaker, “Models for the transmission dynamics of Tuberculosis,” Bill Sears Club, Center for Applied Mathematics, Cornell University, October 1996.
• Invited Seminar Speaker, “The role of divorce/separation rates on the evolution of mating systems,” Biometrics Unit Dept. Series (BUDS), Cornell University, October 1996.

1995

• Invited Seminar Speaker, "To Treat or not to Treat: the Case of Tuberculosis," Dept. of Mathematics, Arizona State University, AZ, Nov., l995.
• Invited Seminar Speaker, "Mathematical Models in Epidemiology."  Dept. of Applied Mathematics, Caltech University, Pasadena, CA, May 1995.
• Invited Seminar Speaker, "The Role of Co-Evolution in Epidemiology."  Dept. of Biology, Caltech University, Pasadena, CA, May 1995.
• Invited Seminar Speaker, "Social Structure and the Dynamics of HIV/AIDS."  Dept. of Humanities and Social Sciences, Caltech University, Pasadena, CA, May 1995.
• Invited Seminar Speaker, "Mathematical Models in Epidemiology."  Department of Statistics, University of Bern, Switzerland 1995.
• Invited Lecturer:  Lecture in Mathematical Epidemiology. Centro de Investigacion de Salud Publica del Instituto Nacional de Salud Publica, Cuernavaca, Morelos, Mexico, 1995.
• Invited Lecturer, "Epidemiologia y Demografia Teorica y sus Aplicaciones a la Salud “ Centro de Investigacion de Salud Publica del Instituto Nacional de Salud Publica, Cuernavaca, Morelos, Mexico, 1995.
• Plenary Speaker, "Coevolution of Pathogens," 4th International Conference on Mathematical Population Dynamics, Rice University, 1995.
• Key Note Speech, "Science, Diversity and Affirmative Action," Semana Latina, Caltech University, Pasadena, CA., 1995.
• Invited Speaker, "Factors Affecting the Predictions of HIV/AIDS Prevalence: The Role of Social Dynamics."  Health and Human Development Department and Center for Population Research, Hispanic Heritage Month, Penn State University, PA. 1995.
• Invited Special Session Speaker, "Epidemiology and Behavior: the HIV/AIDS Epidemic."  ICIAM, Special Session in Epidemiological Models, Hamburg, Germany, 1995.
• Invited Lecturer, “Epidemiologia y Demografia Teorica y sus Aplicaciones a la Salud Publica." Ten hour course/seminar for biologists, epidemiologists, statisticians, public health experts, and other scientists. Belgrano University, Buenos Aires, Argentina, August 1995.
• Invited Lecturer, "Epidemiologia y Demografia Matematica": A 20-hour course/seminar for biologists, statisticians, and mathematicians.  Facultad de Ciencias, Universidad Autonoma de México, June 1995.
• Invited Lecturer, "Demografia Teorica": A 4-hour course/seminar for sociologists, statisticians, and other scientists.  Colegio de la Frontera Norte, Tijuana, México, May 1995.
• Invited Speaker, "The Politics of Representation in the Sciences: Why is it Important to be a Latino Scientist?"  Ithaca College, NY, Nov., 1995.
• Invited Seminar Speaker, What can a Mathematician tell you about the HIV/AIDS Epidemic."  CAL State, Los Angeles, CA, 1995.
• Invited Seminar Speaker, “To Treat or not to Treat: The Case of Tuberculosis."  Bill Sears Club, Center for Applied Mathematics, Cornell University, 1995.
• Invited Seminar Speaker, "The Politics of Representation in the Sciences: Why is it important to be a Latino Scientist?"  Science Organization for Latinos, Cornell University, December 1995.

1994

• Invited Seminar Speaker, "Social Dynamics and Epidemiology: The HIV/AIDS Epidemic."  Dept. of Biology, Princeton University, NJ, March, l994.
• Invited Lecturer: Lectures in Mathematical Epidemiology, International Congress in Biomathematics, III Encuentro Latinoamericano de Ecologia Matematica, Universidad Nacional de Lujan, Republica Argentina, 1994.
• Invited Special Session Speaker, "On the Existence of Stable Paired Distributions in Demography."  First World Congress on Computational Medicine, Public Health and Biotechnology, Austin, TX, 1994.
• Invited Seminar Speaker, "Factores Epidemiologicos y Sociales en la Dinamica del SIDA," Centro de Investigacion de Salud Publica del Instituto Nacional de Salud Publica, Cuernavaca, Morelos, Mexico, July, 1994.
• Invited Seminar Speaker, "Evolucion de Micro-organismos en Poblaciones Heterogéneas," Centro de Ecologia de la Universidad Autonoma de México, Ciudad Universitaria, México, July 1994.
• Invited Speaker, "Epidemiological Models: Part I," International Congress in Biomathematics, III Encuentro Latinoamericano de Ecologia Matematica, Universidad Nacional de Lujan, Republica Argentina, August 1994.
• Invited Speaker, "Epidemiological Models: Part II," International Congress in Biomathematics, III Encuentro Latinoamericano de Ecologia Matematica, Universidad Nacional de Lujan, Republica Argentina, August 1994.
• Invited Speaker,"Epidemiological Models: Part III," International Congress in Biomathematics, III Encuentro Latinoamericano de Ecologia Matematica, Universidad Nacional de Lujan, Republica Argentina 1994.
• Invited Seminar Speaker, “Sociology meets epidemiology: the AIDS epidemic," Belgrano University, Buenos Aires, Argentina, August 1994.
• Invited Seminar Speaker, "Coevolution: The case of influenza and myxomatosis," Instituto de Investigaciones Bioquimicas-Fundacion Campomar, Buenos Aires, Argentina, August 1994.
• Invited Seminar Speaker, "The use of epidemiological models in biology," Instituto Nacional de Investigaciones Agropecuarias, Buenos Aires, Argentina, August 1994.
• Summer Invited Workshop Presentation,  "Why have I chosen to do research in mathematical biology?"  Department of Education, Cornell University, September 1994.
• Invited Seminar Speaker, "Views on Affirmative Action." Cornell University Chaplains, 1994.

1993

• Invited Speaker, "Mathematical Models for pair formation."  Seminar Angewandte Mathematik, Institut für Biologie II, Tübingen University, Tübingen, Germany, 1993.
• Invited Lecturer: Sixth International Congress in Biomathematics.  Short course in Epidemiology, San Jose de Costa Rica.
• Community Lecture, "The Role of Social Dynamics in HIV/AIDS," Northeast Chapter of SACNAS, Cornell University, Ithaca, NY, 1993.
• Invited Seminar Speaker, "Marriage Functions in Open Networks: the Case of Sexually-Transmitted Diseases."  RIVM, Bilthoven, National Institute of Public Health and Environmental Protection, The Netherlands 1993.
• Invited Seminar Speaker, "Role of Biases on the Study of the Dynamics of Sexually-Transmitted Diseases."  Centrum voor Wiskunde en Informatica, Amsterdam, the Netherlands, 1993.
• Invited Speaker, "On the Solution of the Two-Sex Problem or it takes two to Tango."  Conference on "Quantitative Methods for Studying AIDS.  Sponsored by SIMS.  Heinrich-Fabri-Institut, Conference Center, Tübingen University, Blaubeuren, Germany, 1993.
• Invited Speaker, "Mixing Functions in Open Social Networks: the Case of Sexually Transmitted Diseases."  WELCOME Research Centre Seminar Programme, Imperial College of Science and Technology, London, England, 1993.
• Distinguished Speaker, "Investigator's Biases, Social Dynamics and the HIV/AIDS Epidemic."  Speaker - Kieval Harry S. Distinguished Lecture Series, Humboldt State University, 1993.
• Invited Seminar Speaker, "Mathematical Models in Epidemiology."  Colloquium Series, Department of Mathematics, Humboldt State University, 1993.
• Invited Speaker, "Efectos de la estructura social en la dinamica de poblaciones."  II Coloquio Latinoamericano de Analisis.  Bogota, Colombia, November 1993.
• Invited Speaker, "Modelos con estructura social y el SIDA," Departamento del Hombre y su Ambiente, Biomathematics Club, Universidad Metropolitana-Xochimilco, México City, México, December 1992.
• Invited Speaker, "Modelos matematicos en la epidemiologia," Sexto Congreso Internacional en Biomatematicas, San José de Costa Rica, October 1993.
• Invited Seminar Speaker, "SIDA."  Seminario de Biomatematicas en el ciclo sobre Epidemiologia Matematica, Facultad de Ciencias, Departamento de Matematicas, Universidad Nacional Autonoma de México, México City, December 1993.
• Invited Speaker, Closing Remarks, Conference "Hispanics by Profession," Hispanic American Studies Program, Cornell University, February 1993.

1992

• Invited Lecturer: International Course in Epidemiology, Ministerio de Salud de México, and Harvard University, 1992.
• Invited Speaker, "Social Dynamics meets Biology: The AIDS Epidemic."  Gordon Conference, 1992.
• Plenary Speaker, "Social Dynamics Meets Epidemiology," 3rd International Conference on Mathematical Population Dynamics, University of Pau, France, 1992.
• Invited Seminar Speaker, "Social Dynamics and the HIV/AIDS Epidemic."  Biology Colloquium, California State University at Northridge, NIH-M.A.R.C. Program, 1992.
• Invited Distinguished Speaker, "Marriage Functions: Theory and Applications."  Institute for Theoretical Dynamics, Center for Population Biology, and Graduate Group in Epidemiology.  Distinguished Minority Visiting Scholar Program.  University of California, Davis, 1992.
• Invited Distinguished Speaker, "Sociology Meets Epidemiology: A unified Approach to Modelling Sexually-Transmitted Diseases."  Institute for Theoretical Dynamics, Center for Population Biology, and Graduate Group in Epidemiology.  Distinguished Minority Visiting Scholar Program.  University of California Davis, 1992.
• Invited Seminar Speaker, "Social Dynamics and AIDS: The Effects of Social Structure on the Dynamics of Sexually-Transmitted Diseases."  Graduate School of Public Affairs, University of Colorado, Denver, CO, 1992.
• Invited Seminar Speaker, "Epidemic Models, Socio-Dynamics and AIDS."  Occidental College, CA, 1992.
• Invited Seminar Speaker, "Obstacles to Predicting HIV Incidence and Prevalence: The Effects of Social Dynamics."  INSERM-U 263 (Paris VII), Paris, France, 1992.
• Invited Seminar Speaker, "Epidemics and the Dynamics of HIV/ AIDS."  CAL State Nothridge, CA, 1992.
• Invited Seminar Speaker, "Marriage Functions in Demography," Rural Sociology and Population Development Seminar, Cornell University, January 1992.

1991

• Distinguished Invited Lecturer, National Research Council of Taiwan, Series of Lectures at various universities and institutes, Taiwan 1991.
• Invited Seminar Speaker, "Cross-immunity and Influenza."  Department of Mathematics, Tsing Hua University, Taiwan, June 1991.
• Invited Seminar Speaker, "Epidemiological models for communicable diseases. Part 1," Department of Applied Mathematics, National Chung-Hsing University, Taichung, Taiwan, June 1991.
• Invited Seminar Speaker, "Epidemiological models for communicable diseases. Part 2," Department of Applied Mathematics, National Chung-Hsing University, Taichung, Taiwan, June 1991.
• Invited Seminar Speaker, "Models for sexually-transmitted diseases. Part 1," Department of Applied Mathematics, National Chung-Hsing University, Taichung, Taiwan, June 1991.
• Invited Seminar Speaker, "Models for sexually-transmitted diseases. Part 2," Department of Applied Mathematics, National Chung-Hsing University, Taichung, Taiwan, June 1991.
• Invited Seminar Speaker, "Modeling the processes of pair-formation and dissolution. Part 1," Department of Applied Mathematics, National Chung-Hsing University, Taichung, Taiwan, June 1991.
• Invited Seminar Speaker, "Modeling the processes of pair-formation and dissolution. Part 2" Department of Applied Mathematics, National Chung-Hsing University, Taichung, Taiwan, June 1991
• Distinguished Invited Speaker, "Determinism in Biology: The Case of the AIDS Epidemic."  Pitzer College Lecture Series on Science, Technology, and Disaster, Pitzer College, Claremont California, 1991.
• Invited Speaker, "On the Estimation of Mixing/Pair Formation Matrices."  Conference on "Statistical Methodology for the Study of the AIDS Epidemic.  Sponsored by SIMS (Societal Institute of the Mathematical Sciences), Mathematics Sciences Research Institute, Berkeley, CA, 1991.
• Invited Speaker, "On the Simulation of Social Dynamics."  Workshop on Epidemiological Modeling, Pittsburgh Supercomputing Center, 1991.
• Invited Seminar Speaker, "Determinism in Epidemiological Systems."  Department of Mathematics, Arizona State University, AZ, 1991.
• Invited Seminar Speaker, "Generalization of the Mass-Action Law and Their Application to Epidemiological Models."  Department of Physics, New York University at Stony Brook, NY, 1991.
• Invited Seminar Speaker," Can there be a marriage function?"  Bill Sears Club, Center for Applied Mathematics, October, l991.

1990

• Invited Seminar Speker, "The Effects of Pair Formation in the Dynamics of Sexually-Transmitted Diseases."  Centre for Mathematical Biology, Oxford University, England, 1990.
• Distinguished Invited Speaker, "Driving Mechanisms for the AIDS Epidemic."  Hollistier-Stier Distinguished Lecture Series, Washington State University, 1990.
• Distinguished Invited Speaker,"The Effects of Proportional and Non-proportional Mixing in the Dynamics of Sexually-Transmitted Diseases."  Hollistier-Stier Distinguished Lecture Series, Washington State University, 1990.
• Invited Speaker, "The Use of Mathematics in the Fight against AIDS: A Personal Perspective."  Conference for Ford Foundation Fellows, National Academy of Sciences, Irvine, California, 1990.
• Invited Special Session Speaker, "Epidemiological Models for Sexually-Transmitted Diseases."  International Conference on Differential Equations and Applications to Biology and Population Dynamics, Claremont, California, 1990.
• Invited Special Session Speaker, "The Effects of Variable Population Size on the Dynamics of Sexually-Transmitted Diseases."  Dynamical Systems Mini-symposium, Summer Meeting of SIAM, Orlando, Florida, 1990.
• Invited Seminar Speaker, "Uso de modelos matematicos en la epidemiologia del SIDA," Department of Mathematics, Universidad del Sagrado Corazon, San Juan, Puerto Rico, 1990.
• Invited Seminar Speaker, "Los efectos de la estructura social en la propagacion del SIDA," Department of Mathematics, Universidad de Puerto Rico, Rio Piedras, Puerto Rico, 1990.
• Invited Seminar Speaker, "Modelos matematicos para la propagacion del SIDA," Department of Mathematics, Universidad de Puerto Rico, Humacao, Puerto Rico, 1990.
• Invited Seminar Speaker, "Estimacion empirica de las probabilidades de contacto sexual en sociedades estructuradas," Joint Statistics and Applied Mathematics Seminar of the IIMAS of the Universidad Nacional Autonoma de México, México City, June 1990.
• Invited Seminar Speaker, "Modelos con estructura social para la propagacion de enfermedades venéreas," Applied Mathematics Seminar, IIMAS, Universidad Nacional Autonoma de México, México City, June, 1990.
• Invited Seminar Speaker, "Modelos para enfermedades transmitidas por vectores con énfasis en el dengue," Centro de Estudios Avanzados del Instituto Politécnico Nacional, June, 1990.
• Invited Seminar Speaker, "Modeling the AIDS Epidemic," Rural Sociology and Population Development Seminar, March 1990.

1989

• Invited Speaker, "Effects of Social Mixing in the Spread of HIV/AIDS."  Workshop on Mathematical Models for Infectious Diseases.  Forschungsinstitut Oberwölfach, Germany, 1989.
• Invited Speaker, "Predicting the Dynamics of Epidemics."  European Symposium on High Performance Computing, Montpellier, France, 1989.
• Special Session Invited Speaker, "Models for the Sexual Transmission of HIV/AIDS," V International Conference on AIDS, Montréal, 1989.
• Invited Speaker, "Pair Formation and Force of Infection in Models for Sexually-Transmitted Diseases."  Workshop on Differential Equations and Applications, Volksbildunghaus Retzhof, Leibniz, Austria, 1989.
• Invited Speaker, "Models for the Spread of Sexually-Transmitted Diseases with General Social Structure and Variable Infectivity."  Fifth IMA Conference on the Mathematical Theory of The Dynamics of Biological Systems, Keble College, Oxford University, England, 1989.
• Invited Special Session Speaker, "On a Theory of Aggregation and Mixing for Epidemiological Models for the Spread of HIV/AIDS."  AIDS Modeling Symposium, Summer Meeting of SIAM, (Society for Industrial and Applied Mathematics), San Diego, CA, 1989.
• Invited Special Session Speaker, "The Role of a Decreasingly Sexually-Active Population and its Social Structure in the Dynamics of AIDS."  Operations Research Meeting (ORSA TIMS), Session in Recent Progress in AIDS Models, New York City, 1989.
• Invited Seminar Speaker, "A Social/Sexual Mixing Framework for the Dynamics of Sexually-Transmitted Diseases."  INSERM-U 263 (Paris VI and VII), Paris, France, 1989.
• Invited Seminar Speaker, "The Role of Long Periods of Incubation in the Dynamics of HIV/AIDS."  INSERM-U 170 (Collaborating Center for the World Health Organization), Paris, France, 1989.
• Invited Seminar Speaker, "Modeling the AIDS Epidemic."  Center for Applied Mathematics, University of Southern California, Los Angeles, CA, 1989
• Invited Seminar Speaker, "Models for Sexually-Transmitted Diseases with Social Structure."  Department of Mathematics, Arizona State University, AZ, 1989.
• Invited Seminar Speaker, "El efecto de la cros-imunidad en la propagacion de la influenza," Centro de Estudios Avanzados del Instituto Politécnico Nacional, March 1989.
• Invited Seminar Speaker, "Los efectos de la estructura social en la propagacion del SIDA" Centro de Estudios Avanzados del Instituto Politécnico Nacional, March 1989.
• Invited Seminar Speaker, "Tres modelos matematicos epidemiologicos simples,” Escuela Superior de Fisica y Matematicas del Instituto Politécnico Nacional, March, 1989.
• Invited Speaker, "Modelos con estructura social para la propagacion del SIDA," II Congreso Nacional sobre SIDA, México, D.F., México, Nov., 1989.
• Invited Seminar Speaker, "AIDS Modeling Project at Cornell."  Center for Applied Mathematics, Cornell University, September 1989.
• Invited Seminar Speaker, "Effects of Social Structure in Disease Transmission."  Epidemiology Forum, Cornell University, December 1989.

1988

• Invited Seminar Speaker, "The Role of Long Periods of Infectiousness and Variable Infectivity in the Dynamics of the HIV."  New York Health Department, Albany, NY, 1988.
• Invited Speaker, "The Importance of Social Mixing in the Dynamics of HIV."  First Autumn Workshop on Mathematical Ecology, Trieste, Italy, 1988.
• Invited Seminar Speaker, "Modelos matematicos del SIDA: primera parte," Centro de Estudios Avanzados del Instituto Politécnico Nacional, June 1988.
• Invited Seminar Speaker, "Modelos matematicos del SIDA: primera parte," Centro de Estudios Avanzados del Instituto Politécnico Nacional, June 1988.
• Invited Seminar Speaker, "Modelos matematicos del SIDA: segunda parte," Centro de Estudios Avanzados del Instituto Politécnico Nacional, June 1988.
• Invited Seminar Speaker, "Modelos matematicos y el SIDA," Escuela Superior de Fisica y Matematicas del Instituto Politécnico Nacional, June 1988.
• Invited Seminar Speaker, "Modelos matematicos sobre la propagacion del SIDA," Instituto de Geofisica de la Universidad Nacional Autonoma de México, June 1988.
• Invited Speaker, "The Role of Long Periods of Incubation, Variable Infectivity, and Social Mixing in the Spread of HIV/AIDS."  Ecology and Systematics Colloquium.  Department of Ecology and Systematics, Cornell University, 1988.
• Invited Speaker, "The Role of Social Mixing in the Spread of AIDS."  Seventh Annual Meeting of the Northeast Regional Science Association, Cornell University, October 1988.
• Invited Speaker, "The Role of Social Mixing in the Dynamics of HIV."  Bill Sears Club, Center for Applied Mathematics, Cornell University, October l988.

1987

• Invited Seminar Speaker, "Role of Cross-immunity in Epidemiological Models."  Dept. of Biology, Princeton University, NJ, May 1, l987.
• Invited Seminar Speaker, "The Role of Cross-Immunity in Viral Diseases:  Myxomatosis, Influenza, and AIDS."  Mathematical Biology Group, University of Iowa, l987.
• Invited Seminar Speaker, "Models for HIV/AIDS Transmission."  Mathematical Biology Group, Courant Institute of Mathematical Sciences, New York University, New York, NY, 1987.
• Invited Seminar Speaker, "Deterministic Models Arising in the Study of the Dynamics of Heterogeneous Populations: An Introduction," Bill Sears Club, Center for Applied Mathematics, Cornell University, April l987.
• Invited Seminar Speaker, "Models for the spread of AIDS." Colloquium, Center for Applied Mathematics, Cornell University, December, l987.
• Invited Seminar Speaker, "The Role of Heterogeneity in the Dynamics of Sexually-Transmitted Diseases."  International Symposium on Mathematical Approaches to Environmental and Ecological Problems, Cornell University, October l987.

1986

• Invited Speaker, "Cross-Immunity in the Dynamics of Homogeneous and Heterogeneous Populations."  General Research Session, Second Autumn Course on Mathematical Ecology, Trieste, Italy, 1986.

1986-1994

• ICTP, Invited Lecturer: Autumn Courses in Mathematical Ecology, Trieste, Italy (1986, 1988, 1990, 1992 and 1994).