| 2002-present | Associate Scientist at the Synchrotron Radiation
Center (SRC), University of Wisconsin, Madison |
| 2000-present | Principal Investigator
of a project funded by the National Science Foundation |
| 1999-2002 | Assistant Scientist at the Synchrotron Radiation
Center (SRC), University of Wisconsin, Madison |
| 1997-1999 | Fellow of the Japan Society for the Promotion of Science
(JSPS) at the Photon Faktory, KEK (Japan) |
| 1994-1997 | Postdoctoral Research Associate at the University of Tennessee,
Knoxville, as a Feodor-Lynen Fellow of the A.v. Humboldt Foundation |
| 1990-1993 | Postdoctoral Research Associate, Fritz-Haber-Institute of the
Max-Planck-Society, Berlin (Germany) |
| 1985-1990 | Research Assistant, Technical University Berlin (Germany) |
| 1984 | Summer student at DESY (Deutsches Elektronen-Synchrotron, Hamburg) |
| 1982-1985 | Teaching Assistant in a lab course for undergraduate students,
Technical University Berlin (Germany) |