CHRISTOPHE BERTOSSI is a Research Fellow and the European Studies Programme Co-ordinator at the French Institute of International Relations (Ifri), Paris, France. Formerly Marie Curie Research Fellow, he is an Associate Fellow at the Centre for Research in Ethnic Relations, University of Warwick, UK, and Research Associate at the Center for Comparative Immigration Studies at the University of California, San Diego, USA. He has published extensively on issues related to citizenship and ethno-cultural diversity in the European context in European and US journals.