2004 -

• Joaquin Bustoz  Jr. Professor, Department of Mathematics and Statistics and School of Life Sciences, Arizona State University.
• Executive Director, SUMS/MTBI

2004 - 2009

• Adjunct Professor, Department of Computational Biology and Biological Statistics, Cornell University

2004-2007

• External Faculty Member, Santa Fe Institute.

2003

• Los Alamos National Laboratory: Center for Nonlinear Studies, Stanislaw M. Ulam Distinguished Scholar.

2002 - 2004

• Professor of Biomathematics, Department of Biological Statistics and Computational Biology, Department of Theoretical and Applied Mechanics, and Department of Statistical Science, Cornell University

1997 - 2004

• Director, Cornell-Sloan Fellowship Program for Underrepresented Minorities, Cornell University

1996 - 2004

• Director, Mathematical and Theoretical Biology Institute (MTBI), Cornell University

1999 - 2001

• Professor of Biomathematics, Department of Biometrics, Department of Theoretical and Applied Mechanics, and Department of Statistical Science, Cornell University

1997 - 2000

• Director, Cornell-Ithaca (High School) Mathematics Enrichment, Cornell University

1998 - 1999

• Professor Biomathematics, Department of Biometrics and Department of Statistical Science, Cornell University

1997 - 1999

• Professor of Biomathematics, Biometrics Department, Cornell University

1995 - 1997

• Chair, Biometrics Unit, Cornell University

1991 - 1997

• Associate Professor of Biomathematics, Department of Plant Breeding and Biometry, Cornell University

1988 - 1991

• Assistant Professor of Biomathematics, Department of Plant Breeding and Biometry, Cornell University

1985 - 1988

• Visiting Assistant Professor and Postdoctoral Student, Department of Ecology and Systematics and Center for Applied Mathematics, Cornell University

1984 - 1987

• Assistant Professor of Applied Mathematics, Department of Mathematics, University of Tulsa