Avner Greif is Professor of Economics, Bowman Family Endowed Professor in Humanities and Sciences at Stanford, and member of the Freeman Spogli Institute for International Studies (FSI). 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 PhD in economics from Northwestern University, and his BA in economics and history from Tel Aviv University.