Universität Bonn
1991-1993: Wissenschaftlicher Mitarbeiter
Queen Mary and Westfield College
1993-1995: SERC Postdoctoral Research Assistant
1995-1998: EPSRC Postdoctoral Research Assistant
1998-1999: Lecturer in Physics
University of Edinburgh
1999-2003: Lecturer in Mathematics
2003-2005: Reader in Mathematics
2005-Present: Personal Chair of Geometric Physics