| 2009- | Professor of Mathematical Physics |
| 2005-2009 | Reader in Applied Mathematics |
| 1999-2005 | Lecturer in Applied Mathematics, University of Southampton |
| 1998-1999 |
Postdoc, Enrico Fermi Institute, Physics Department,
University of Chicago |
| 1996-1998 |
Postdoc, Max Planck Institute for Gravitational Physics
(Albert Einstein Institute), Potsdam |
| 1994-1996 |
Postdoc, LAEFF (Laboratory for Space-Based Astrophysics and
Fundamental Physics), Madrid |
| 1992-1994 | Postdoc, Relativity Group, Physics Department, University of
Utah |
| 1988-1992 |
PhD student, Clare College
and
DAMTP,
University of
Cambridge, supervised by
Prof Gary
Gibbons FRS |
| 1987-1988 | Mathematics Part III, DAMTP, University of
Cambridge |
| 1984-1987 |
Undergraduate student,
Physics Department, University of Hamburg |
| 1983-1984 | Civilian service with Aktion Suehnezeichen /
Friedensdienste, in
St. Andrew's
Church, Newcastle, and Pearce Institute,
Govan, Glasgow |