PhD: Northwestern University, 1975.
Fields of Specialization: Public Economics, Social Choice, Coalition Formation.

PhD: Universitat d'Alacant, 1994.
Fields of Specialization: Social Choice, Public Economics.

PhD: University of Pennsylvania, 1989
Fields of Specialization: Finance, Growth.

PhD: University of Minnesota, 1999.
Fields of Specialization: Macroeconomics, Public Finance.

PhD: Ecole des Hautes Etudes en Sciences Sociales, Paris, 1989.
Fields of Specialization: Economics of Information, Industrial Economics.

PhD: CORE, Université Catholique de Louvain, 1988.
Fields of Specialization: Industrial Organization, Health Economics.

PhD: SUNY at Stony Brook, 1988.
Fields of Specialization: Game Theory, Social Choice.

PhD: Universitat Pompeu Fabra, 1996.
Fields of Specialization: Macroeconomics, Aggregate Fluctuations.

PhD: Northwestern University, 1989.
Fields of Specialization: Economics of Information, Health Economics.

PhD: École des Études en Sciences Sociales, Paris, 1991.
Fields of Specialization: Game Theory, Economics of Information.