| 1968-1969 |
Research Assistant, MV Lomonosov Moscow State University, Moscow |
| 1969-1970 |
Research Assistant, Institute of Oncology, Moscow |
| 1970-1976 |
Research Associate, MV Lomonosov Moscow State University, Moscow |
| 1977-1983 |
Associate Research Professor, MV Lomonosov Moscow State University, Moscow |
| 1983-1989 |
Professor, Head, Membrane Bio-Stabilization Group, Institute of Physiology, Bulgarian Academy of Sciences, Sofia, Bulgaria |
| 1989-1992 |
Associate Research Biochemist, Department of Molecular and Cell Biology, University of California, Berkeley |
| 1989-1992 |
Visiting Scientist, Lawrence Berkeley Laboratory, Berkeley, CA |
| 1992-1997 |
Associate Professor, Department of Environmental and Occupational Health, University of Pittsburgh |
| 1992-present |
Member, Pittsburgh Cancer Institute, Pittsburgh, PA |
| 1997-2001 |
Tenured Associate Professor, Department of Environmental and Occupational Health, University of Pittsburgh |
| 1998-present |
Visiting Professor, Division of Life Sciences, King's College, London, UK |
| 2000-present |
Vice-Chairman, Department of Environmental and Occupational Health, University of Pittsburgh |
| 2001-present |
Professor, Department of Environmental and Occupational Health, University of Pittsburgh |
| 2002-present |
Senior Investigator, Magee-Womens Research Institute, Pittsburgh, PA |
| 2003-present |
Professor, Department of Pharmacology, University of Pittsburgh |
| 2004-present |
Director, Center for Free Radical and Antioxidant Health, University of Pittsburgh |
| 2007-present |
Adjunct Foreign Professor, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden |
| 2007-present |
Professor, Department of Radiation Oncology, School of Medicine, University of Pittsburgh |
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