Since 2021
Deputy Head of the FIS Centre, Duisburg-Bremen

Since 2020
Speaker of the DFG's Review Board for the Social Sciences

2011-2012
Senior Fellow, Forschungskolleg Human Sciences, Bad Homburg

2007
Visiting Researcher, MacMillan Center for International and Area Studies, Yale University, New Haven, CN, USA

2006
Visiting Researcher, Max Planck Institute for the Study of Societies, Cologne, Germany

Since 2002
Professor of Political Science and Head of the Department "Theory and Constitution of the Welfare State", Centre for Social Policy (ZeS), University of Bremen

2000-2002
Professor of Political Science, University of Essen

2000
Substitute Professor of Political Science (Social Policy), University of Konstanz

1997-2000
Scientific Director, "Project University Development", University of Hamburg, financed by the Volkswagen Foundation

1991-1997
Hochschulassistent, Political Science, University of Hamburg

1987-1991
Researcher, Political Science, University of Hanover

1986
Researcher, Interdisciplinary Centre for University Teaching and Learning, University of Hamburg

1981-1985
Researcher, Institute of Public Finance, University of Hamburg