Dr. Xavier Guillaume is Lecturer in political science/international relations at the Department of Political Science, University of Geneva, Switzerland. His work is centred on the mostly left out sociological dimension of the identity/difference nexus in IR. He has published in journals not only concentrating on international relations (e.g. Millennium, International Political Sociology) but also on more targeted topics such as Japan (Japanstudien). He is also actively involved in the editorial teams of International Political Sociology and is Associate Editor of Contemporary Political Theory. His first monograph, International Relations and Identity: A Dialogical Approach, will be published in July 2010 (Routledge). Dr. Jef Huysmans is Senior Lecturer in the Department of Politics and International Studies and Director of the Centre for Citizenship, Identities and Governance at the Open University (UK). He is senior researcher in the Framework VII programme project ENACT (Enacting European Citizenship). His research centres on the political significance of security practice in Western societies, the securitization of immigration, asylum and refugees, and the politics of fear and exception. He is author of The Politics of Insecurity. Fear, Migration and Asylum in the EU (Routledge 2006); What is Politics? (Edinburgh University Press, 2005); edited with Andrew Dobson and Raia Prokhovnik, The Politics of Protection. Sites of Insecurity and Political Agency (Routledge 2006), and with Patricia Noxolo Community, Citizenship and The 'War on Terror'.(Hampshire, Palgrave 2009)