· Researcher, Center for the Mathematics of Information, Caltech2024–
· Chair of the Faculty, California Institute of Technology1999–2001
· Executive Officer for the Social Sciences, California Institute of Technology1995–1999
· Director of Graduate Studies for the Social Sciences, California Institute of Technology1994–1996
· Associate Professor of Economics, California Institute of Technology1983–1995
· Assistant Professor of Economics, California Institute of Technology1979–1983
· Ph.D. in Economics, University of Minnesota1979–
· B.S. in Economics, California Institute of Technology1974–