Sylvain Sorin is a professor at the Universite Pierre et Marie Curie and a member of the Institut de Mathematiques Jussieu-Paris Rive Gauche (Centre National de la Recherche Scientifique, Unite Mixte de Recherche 7586). He was previously a professor at the Universite L. Pasteur, Strasbourg, and the Universite Paris X Nanterre. He was an affiliated member of the Departement de Mathematiques, Ecole Normale Superieure, Paris; Laboratoire d'Econometrie, Ecole Polytechnique, Palaiseau; and the Center for Game Theory in Economics, State University of New York at Stony Brook. He is a Fellow of the Ec...