Elinor Ostrom is Arthur F. Bentley Professor of Political Science; Co-Director of the Workshop in Political Theory and Policy Analysis, Indiana University, Bloomington; and Founding Director, Center for the Study of Institutional Diversity, Arizona State University. She is a member of the National Academy of Sciences, the American Academy of Arts and Sciences, and a recipient of the Frank E. Seidman Prize in Political Economy and the Johan Skytte Prize in Political Science. Her books include Governing the Commons; Rules, Games, and Common-Pool Resources (with Roy Gardner and James Walker); Local Commons and Global Interdependence (with Robert Keohane); The Commons in the New Millennium (with Nives Dolšak); The Samaritan’s Dilemma: The Political Economy of Development Aid (with Clark Gibson, Krister Andersson, and Sujai Shivakumar); and Understanding Institutional Diversity.