| 2001-present | Director of Materials Theory Institute at MSD |
| 1992-2000 | Coordinator of the Visiting Theory Program at Materials Science Division |
| 1998-present | Senior Scientist at Materials Science Division Argonne National Laboratory |
| 1992-1998 | Scientist at Materials Science Division Argonne National Laboratory |
| 1988-1992 | Senior Scientist at the Theoretical Department of the Institute of Solid State Physics Ac. Sci. USSR |
| 1990-1992 | Visiting Scientist at Materials Science Division Argonne National Laboratory |
| 1981-1987 | Scientific Researcher at the Theoretical Department of the Institute for Solid State Physics, Chernogolovka |
| 1980-1981 | Postdoctoral experience at Low Temperature Physics Laboratory of the ISSP |
| 1973-1980 | Research Associate at the Dislocation Physics Laboratory of the Institute for Solid State Physics, Chernogolovka |
| 1987 (Sept.-Nov.) | CRTBT-C.N.R.S., Grenoble, France |
| 1988 (Nov.) | Service de Physique du Solide CEA-Saclay, France |
| 1989 (Sept.-Dec.) | Kamerlingh Onnes Lab, Leiden University, Leiden, The Netherlands |
| 1990 (Feb.-May) | Theor. Physik, ETH, Zurich, Switzerland |
| 1997 (May) | Visiting Professor, École Normale Supérieure, Paris, France |