Date of birth: 12.11.1963, Aachen, Germany

• 9/1988:
  Diploma in Mathematics, RWTH Aachen
• 3/1993:
  Dr.rer.nat. (PhD), RWTH Aachen
• 6/1996:
  Habilitation and venia legendi in Mathematics, RWTH Aachen

• 1996, part of 1998/99:
  Assistant Professor (C1), RWTH Aachen
• 1/1997 - 9/1997:
  Professor (C3, by proxy) in Mathematics, RWTH Aachen
• 2/1997 - 4/1997:
  Visiting Professor, University of Mons, Belgium
• 10/1997 - 12/1997:
  Visiting Professor, Universidad de Chile, Santiago, Chile
• 9/1998 - 12/1998:
  Visiting Position at Mathematical Sciences Research Institute, Berkeley; Special semester on Foundations of Computational Mathematics
• 10/1999 - 2/2000:
  Professor (C4, by proxy) in Theor. Computer Science, TU Chemnitz, Germany
• 3/2000 - 9/2007:
  Associate Professor in Computer Science, University of Southern Denmark, Odense, Denmark
• 9/2005 - 1/2006:
  Sabbatical at Forschungsinstitut für Diskrete Mathematik, Universität Bonn, Germany
• 7/2007:
  Visiting Professor at ENS Lyon, France
• Since 10/2007:
  Full Professor (W3) in Theoretical Computer Science, BTU Cottbus, Cottbus, Germany

• Managing Editor Mathematical Logic Quarterly (since 2011, member editorial board from 2007 on)
• Member editorial board Journal of Complexity (since 2005)

• Working group Foundations of Computational Mathematics
• Deutsche Vereinigung für Mathematische Logik und Grundlagen der exakten Wissenschaften DVMLG
• Working group COMPUTABILITY IN EUROPE (CiE), Marie Curie Training Network (RTN)
• Working group Computability and Complexity in Analysis