Walter Mattli joined Oxford University in 2004 and previously taught at Columbia University. He received a Ph.D. from the University of Chicago in 1994. His publications include The Logic of Regional Integration: Europe and Beyond (1999), The Politics of Global Regulation (2009; co-edited with N. Woods), The New Global Rulers: The Privatization of Regulation in the World Economy awarded the 2012 Best Book Award of the International Studies Association (2011, co-authored with T. Büthe), Institutional Choice and Global Commerce (2013, co-authored with J. Jupille & D. Snidal). He is Professor of International Political Economy in the Department of Politics and International Relations at Oxford University and Fellow of St. John's College, Oxford.; Thomas Dietz has spent two years as postdoctoral researcher at the University of Oxford Law Faculty and Wolfson College. He is Assistant Professor in Politics and Law at the University of Muenster, Germany.