Michael Barnett is University Professor of International Affairs and Political Science at the George Washington University. Among his recent books are Eyewitness to a Genocide: The United Nations and Rwanda (Cornell University Press, 2002); Rules for the World: International Organizations and World Politics (with Martha Finnemore, Cornell University Press, 2004); Power in Global Governance (co-edited with Raymond Duvall, Cambridge University Press, 2004); Humanitarianism in Question: Politics, Power, Ethics (co-edited with Thomas G. Weiss, Cornell University Press, 2008); and In a World of Hurt: Humanitarianism Through the Ages (Cornell University Press, 2011). Thomas G. Weiss is Presidential Professor of Political Science at The Graduate Center of the City University of New York and Director of the Ralph Bunche Institute for International Studies, where he is Co-director of the United Nations Intellectual History Project. He was President of the International Studies Association (2009-2010) and Chair of the Academic Council on the UN System (2006-2009); editor of Global Governance; Research Director of the International Commission on Intervention and State Sovereignty; Research Professor at Brown University's Watson Institute for International Studies; Executive Director of the Academic Council on the UN System and of the International Peace Academy; a member of the UN secretariat; and a consultant to several public and private agencies. His latest authored books include Global Governance and the UN: An Unfinished Journey (with Ramesh Thakur, Indiana University Press, 2010); What's Wrong with the United Nations and How to Fix It (Polity, 2009); UN Ideas That Changed the World (with Richard Jolly and Louis Emmerij, Indiana University Press, 2009); and Humanitarian Intervention: Ideas in Action (Polity, 2007).