| 1991-now | rofessor, Mathematics College, Independent Moscow University | |
| 1995-1997 | Leading researcher, | |
| 1997-now | Principal researcher, Department of Geometry and Topology, Steklov Mathematical Institute of Russian Ac. Sci., Moscow | |
| 1990-1995 | Leading researcher, Department of Mathematics, Research Institute for System Studies, Moscow | |
| 1989-90 | Senior researcher, Department of Functional Analysis, Institute of Applied Mathematics, Russian Ac. of Sci., Moscow | |
| 1987-89 | Senior researcher, Statistical Information Systems Research Institute, Moscow | |
| 1982-86 | Teacher, Specialized Mathematical High School 57, Moscow (part-time) | |
| 1981-87 | Senior researcher, Documents and Archives Research Institute, Moscow |