Peter J. Katzenstein is Walter S. Carpenter, Jr. Professor of International Studies at Cornell University. His books include A World of Regions, Beyond Japan, Cultural Norms and National Security, and Small States in World Markets, all from Cornell. Robert O. Keohane is Professor of International Affairs, Woodrow Wilson School of Public and International Affairs, Princeton University. His books include After Hegemony: Cooperation and Discord in the World Political Economy, Power and Governance in a Partially Globalized World, and, with Joseph S. Nye, Jr., Power and Interdependence.