| 2014- | W2 Professor in Experimental Physics, RWTH Aachen University |
| 2011- | Group Leader in the Peter Grünberg Institute for Semiconductor Nanoelectronics (PGI-9), Forschungszentrum Jülich |
| 2008‑2011 | Associate Professor and Group Leader in the Department of Photonics, Technical University of Denmark |
| 2001-2007 | Senior Research Scientist in the Toshiba Cambridge Research Laboratory |
| 1999-2000 | Research Fellow in Oxford University |
| 1997-1998 | Research Fellow in Arizona State Universit |
| 1996 | Research Fellow in the University of Cambridge |