Institute of Advanced Study Advisory Committee, September 12, 2012
Nominating Committee, American Academy of Arts and Sciences, 2003 (Economics Section)
Executive Committee, Game Theory Society, 2003
Associate Editor, Quantitative Finance, 2000-
Co-Editor, Journal of Mathematical Economics, January 1997-
Associate Editor, Journal of Economic Theory, 1986-2000
Associate Editor, Economic Theory, 1990-1992
Associate Editor, Journal of Mathematical Economics, 1985-1990
Associate Editor, Games and Economic Behavior, 1986-1988
Overseers Visiting Committee to Evaluate Harvard Economics Department, 1985-1991
Economics Department Review Committee, New York University, 1996
Member, Panel on Privatization of Social Security, National Academy of Social Insurance, June 1996-1998
Hale Foundation, 50th Anniversary Steering Committee, 1997
Alfred P. Sloan Foundation, Program Committee for the Alfred P. Sloan Research Fellowships in Economics, 1996-2002
Charter Member, Game Theory Society 1999-
Organizer, Conference on Beyond Equilibrium and Efficiency, Santa Fe Institute, 2000