Klaus-Jürgen Nagel is Professor of Political Science at Universitat Pompeu Fabra (Barcelona). His research interests include political theory (nationalism, federalism) and comparative politics (nationalist parties and movements, European Integration). He has also worked on Catalan history (national movement, working class movement, history of the wine sector). He studied social sciences and history at the universities of Münster and Bielefeld and obtained his Staatsexamen in 1981 (in both history and social sciences) and his doctoral degree in 1989 (in philosophy). Before he changed to Universitat Pompeu Fabra, Nagel had worked at Universität Bielefeld (history departament) and Johann Wolfgang Goethe-Universität Frankfurt am Main (social sciences department).