• Professor, University of  Education, PH Ludwigsburg (since 2006)
• Visiting Scholar, Statistics Department, University of California Berkeley (Aug 2016-Jan 2017)
• Professor, Leibniz-University Hannover (2004-2006)
• StR aeH, PH Ludwigsburg (1994-2004)
• Wissenschaftlicher Mitarbeiter SFB 303, University of Bonn (1993-1994)
• Wissenschaftlicher Mitarbeiter, SFB 123, University of Heidelberg (1989-1992)
• Visiting Assistant Professor, University of Michigan, Dept. of Statistics, Ann Arbor, (1988-1989)
• Teaching Assistant, University of Southern California, Los Angeles (1985-1988)

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