| research assistant | Polarography Group,
Department of Chemistry University of Warsaw Warsaw, Poland |
1989-1990 |
| teaching assistant | Department of Chemistry,
University of Utah, Salt Lake City, Utah |
1990-1994 |
| research assistant | Department of Chemistry,
Hong Kong University, Hong Kong |
1995 |
| computer consultant | Utah Supercomputing Institute,
University of Utah, Salt lake City, Utah |
1995-1996 |
| research assistant | Department of Chemistry,
Brigham Young University, Provo, Utah |
1997 |
| postdoctoral researcher | Department of Chemistry,
University of Maine, Orono, Maine |
1998-... |
| visiting scientist | Queen's University of Belfast,
UK |
2000 |