Didier Bigo is Professor of International Relations (and Maître de conférences des universités) at Sciences-Po Paris, and Researcher at CERI/FNSP. Bigo is also Professor at Kings College London. Elspeth Guild is a Jean-Monnet Professor of European migration law at the Radboud University Nijmegen (The Netherlands). She is also Senior Research Fellow at the Centre for European Policy Studies in Brussels and a partner at the London law firm Kingsley Napley.Mark Gibney is the Carol Belk Distinguished Professor at the University of North Carolina-Asheville and an Affiliated Scholar at the Raoul Wallenberg Institute.