Avner Greif is Professor of Economics and Bowman Family Endowed Professor in Humanities and Sciences at Stanford. His research interests include European economic history: the historical development of economic institutions, their interrelations with political, social and cultural factors and their impact on economic growth. Some of his publications are: Institutions and the Path to the Modern Economy: Lessons from Medieval Trade (Cambridge University Press, March 2006); Impersonal Exchange without Impartial Law: The Community Responsibility System (Chicago Journal of International Law, 2004); How Do Self-enforcing Institutions Endogenously Change? Institutional Reinforcement and Quasi-Parameters (with David Laitin, American Political Science Review, 2003); Analytic Narratives (Oxford University Press, 1998). Avner Greif received his Ph. D. in economics from Northwestern University, and his B.A. in economics and history - from Tel Aviv University.