Frank Schimmelfennig is Professor of European Politics, Center for Comparative and International Studies, ETH Zurich. His research focuses on European integration and, specifically, integration theory, enlargement, differentiated integration, EU democracy promotion and democratization. Previous publications include Ever Looser Union? Differentiated European Integration (with Thomas Winzen, OUP, 2020) and The EU, NATO, and the Integration of Europe: Rules and Rhetoric (CUP, 2003, Winner of the EUSA Best Book Award 2005). Thomas Winzen is a Lecturer in Government, University of Essex. His research focuses on the design and legitimate governance of the European Union and other international institutions with a particular interest in differentiated integration, parliamentarization, and emerging structures of global internet governance. Previous publications include Ever Looser Union? Differentiated European Integration (with Frank Schimmelfennig, OUP, 2020) and Constitutional Preferences and Parliamentary Re
