| 2004 – |
Director at the Max Planck Institute for Nuclear Physics, Heidelberg (Germany) |
| 2005 – |
Honorary Professor (Honorarprofessor) at the Faculty of Physics and Astronomy, Heidelberg University (Germany) |
| 2000 – 2005 |
Lecturer (Privatdozent) at the Faculty of Physics, University of Freiburg (Germany) |
| 2003 – 2004 |
Lecturer of Physics (Hochschuldozent) at the University of Freiburg (SS 03, C2) and Heinrich Heine University Düsseldorf (WS 03/04, C4), (Germany) |
| 1998 – 2003 |
Junior Group Leader (Nachwuchsgruppenleiter) "Theory of atomic systems in intense laser fields'' at the DFG funded Special Research Area 276, Faculty of Physics at the University of Freiburg (Germany) |
| 1997 – 1998 |
Marie Curie Fellow, Institute for Theoretical Physics, University of Innsbruck (Austria), with Prof. P. Zoller |
| 1992 – 1997 |
Postdoctoral Research Associate at the Blackett Laboratory (Optics Section) of the Imperial College, London (UK), with Prof. Sir P. L. Knight FRS |
| 1989 – 1992 |
Research Assistant (Associate since 1991) at the Center for Advanced Studies, University of New Mexico, Albuquerque (USA) and at the Max Planck Institute for Quantum Optics, Garching (Germany), with Prof. M. O. Scully and Prof. H. Walther |