Research Fellow, Post-Graduate School of Public Administration, German University of Administrative Sciences, Speyer, 1989-1991; Dean, Faculty of Economics and Social Sciences, University of Potsdam, since 2009; Lecturer, Senior Lecturer, Reader in Government, Department of Government, London School of Economics and Political Science (LSE), 1992-2006; Research Officer, Centre for European Studies, Nuffield College, Oxford, 1991-1992; Chair of German and European Politics and Government, Faculty of Economics and Social Sciences, University of Potsdam, since 2006; Seit 2013 Lehrstuhl für Politische Systeme und Europäische Integration am Geschwister-Scholl-Institut für Politikwissenschaft der Ludwig-Maximilians-Universität in München