• 07/2007 - ??/???? Professor of Computer Science, University of Koblenz-Landau, Germany
• 01/2005 - 07/2007 Program Manager R&D, Microsoft Corp., Redmond, WA, USA
• 01/2001 - 03/2005 Assistant Professor (permanent), VU Amsterdam, NL
• 01/2001 - 01/2005 Researcher (part-time), CWI, Amsterdam, NL
• 07/1999 - 01/2001 PostDoc, CWI, Amsterdam, NL
• 01/1999 - 06/1999 Lecturer (permanent), University of Rostock, Germany
• 01/1993 - 12/1998 PhD student, University of Rostock, Germany