| 1990-1995 | Studies of Social Science and Modern History at Ruhr-University Bochum |
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| 1995 | Diplom (similar to Master degree) in Social Science at Ruhr-University Bochum |
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| 1993-1997 | Freelancer for the Frankfurter Rundschau, Süddeutsche Zeitung and Westdeutsche Allgemeine Zeitung |
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| 1995-1998 | Junior researcher at the Ruhr-University of Bochum, funded by the German Science Foundation (DFG) |
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| Since 1995 | Activities in organisational and political consulting
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| 1998 | Ph. D. in Social Science at Ruhr-University Bochum |
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| 1999-2007 | Assistant Professor of Political Science at Heinrich-Heine-University Düsseldorf |
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| 2001 | Visiting scholar at the University of California, Berkeley |
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| 2002-2009 | Substitution of professorships at the University of Duisburg-Essen, the University of Wuppertal, Phillips-University Marburg, and the University of Siegen |
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| 2005 | Postdoctoral degree, teaching qualification and teaching permission ("Venia Legendi") for the subject Political Science at the Faculty of Philosophy of the Heinrich-Heine-University Düsseldorf |
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| 2007-2008: | Lecturer at Radboud Universiteit Nijmegen, Netherlands |
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| Since July 2009 | Professor of Political Science at the University of Siegen |
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| | Member of the Scientific Advisory Board, Federal Department of Nutrition, Agriculture and Consumer Protection |
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| | Spokesman of the Arbeitskreises "Verbände" in der Deutschen Vereinigung für Politische Wissenschaft (DVPW) (work group "organisations" of the German Political Science Association)
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| | Board member of the section "Social Policy" of the Deutsche Gesellschaft für Soziologie (DGS) (German Sociology Association)
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