- Professor of Sociology, Social Inequality and Stratification, Faculty of Sociology, Bielefeld University
- Research Professor at the German Institute for Economic Research (DIW), GSOEP-Group, Berlin
- since 10/2008 Professor of Sociology (W3), Social Inequality and Stratification, Faculty of Sociology, Bielefeld University
- since 4/2007 Research Professor at the German Institute for Economic Research (DIW), GSOEP-Group, Berlin
- Professor of Sociology (W3), Social Inequality and Stratification, Institute of Sociology, University Duisburg-Essen(2006-2008)
- Professor of Sociology (W2), Empirical Research Methods, Department IV, University of Trier (2005-2006)
- Deputy Professor of Sociology, Institute of Sociology, University Duisburg-Essen (2004-2005)
- Head of the Research Group “Interdisciplinary Social Justice Research“ at the Institute of Social Science, Humboldt-University Berlin (1998-2004)
- Lecturer for Empirical Research Methods at the Institute of Social Science, Humboldt-University Berlin (1993-1998)
- Lecturer for Empirical Research Methods at the Faculty of Economy and Social Sciences, University of Potsdam (1993-1993)
- Research Assistant, Institute of Sociology, University of Heidelberg (1991-1993)
- Head of the Advisory Board of the German General Social Survey (“ALLBUS”) (since May 2009)
- Habilitation, Faculty of Social Science, Ludwig-Maximilians-Universitaet Munich (2004, Venia legendi: Sociology)
- Ph.D., Humboldt-Universitaet Berlin (1997, summa cum laude)
- Protestant Theology at University of Heidelberg (Dipl. Theol., 1991) and Sociology at University of Heidelberg (M.A., 1992)
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