Noel Parker is Associate Professor in Political Theory and the History of Ideas at the University of Copenhagen, Denmark. His books include Empire and International Order (2012); The Geopolitics of Europe's Boundaries: Spaces, Centres and Margins (2008); and Margins in European Integration (2000).

Nick Vaughan-Williams is Reader in International Security, University of Warwick, UK. His books include: Border Politics: The Limits of Sovereign Power (2009, 2012) (2011 Gold Winner, Association for Borderlands Studies); Critical Security Studies: An Introduction (2010); Critical Theorists and International Relations (2009) and Terrorism and the Politics of Response (2009).