| July 1, 1995 - Present | Professor | Department of Mechanical Engineering | University of California, Berkeley |
| 1985-1995 | Professor Associate Professor |
Fuel Science Program, Department of Materials Science | The Pennsylvania State University |
| 1985-1986 | Alexander von Humboldt Research Fellow | Institute of Applied Physical Chemistry | Heidelberg University |
| 1979-1983 | Associate Professor (with Tenure) Assistant Professor |
Department of Chemical Engineering | Louisiana State University |
| 1978-1979 | Post-doctoral Associate | Department of Chemistry | Massachusetts Institute of Technology |
| 1976-1978 | Research Associate | Department of Mechanical Engineering | McGill University, Montreal, Canada |
| 1972-1976 | Teaching Assistant | Department of Physical Chemistry | Hebrew University, Jerusalem, Israel |
| 1969-1971 | Researcher | Department of Basic Organic and Petrochemical Synthesis | Mendeleyev Institute of Chemical Technology, Moscow, USSR |