International/National:

2006-

• Co-chair 2006 SIAM annual meeting

2004-05

• Member, Steering Committee of the International Congress of Applied Mathematics, Santiago de Chile, March 2006.

2005-07

• Committee on Committees, AMS (02/01/05-01/31/07)

2004

• Nominating Committee, AMS (01/04-12/31)

2003-05

• Elected to SIAM’s Council (2003-2005).
• SIAM’s Education’s Committee (2003-_
• Member, Award Committee, David Blackwell and Richard Tapia Distinguished Lecture Series in the Mathematical and Statistical Sciences.

2002-2007

• Member, Advisory Committee DIMACS Special Focus Program on "Computational and Mathematical Epidemiology."

2002-2004

• Member and Chair (2003), Liaison Committee of AAAS (American Association for the Advancement of Science) and AMS (American Mathematical Society), Feb 1, 2002-January 31, 2004.

2002-2004

• Member, Steering Committee “Committee for the Review of the Evaluation Data on the Effectiveness of NSF-Supported and Commercially Generated Mathematics Curriculum Materials,” National Academies, 2002-2004.”

2002

• Co-Chair, Steering Committee, NSF Math-Biology-Computer Science Meeting, March 27, 2002. NSF-NIH collaborative effort on Math-Biology Education.
• Member, Scientific Committee, ”, Third International Conference on Mathematical Biology, Satellite Meeting for the International Congress of Mathematician, in Guilin, Guangxi Province, P.R. China, August 15-18, 2002.

1997-2000

• Member, Human Resources Advisory Committee, Mathematical Sciences Research Institute, Berkeley, CA (1997-2000).

1998

• Member, Scientific Committee, Cuarto Encuentro de Ecologia Matematica, August 3-14, 1998, Valparaiso, Chile and Mendoza, Argentina.
• Member, Scientific Committee, Fifth International Conference Mathematical Population Dynamics, Zakopane, Poland, June 21 - 26, 1998.

1997

• Member, Scientific Committee, The International Conference on Mathematical Biology, Hangzhou, China, May 26-29, 1997.
• Member, Scientific Committee:  “Mathematical Models in Medical and Health Sciences,” Department of Mathematics, Vanderbilt University, Nashville, TN, May 28-31, 1997.

1988-89