Professor, Decision Sciences Department, University of Pennsylvania, 1987-2005
Chairman, Social Systems Sciences Department, University Pennsylvania,1985-1986.
Professor, Social Systems Sciences Department, University of Pennsylvania,1981-1987.
Research Professor, Social System Sciences, University of Pennsylvania, April 1978-1980.
Visiting Lecturer, Department of Economics, University of Pennsylvania,1974-1978.
Visiting Lecturer, Department of Economics, Princeton University1977.
Visiting Research Economist, University of California, Berkeley ,January-August, 1974.
Professor, Economic School, Moscow State University, 1970-1973.
Head of the Department of Complex Systems, Central Economic-Mathematical Institute, U.S.S.R.Academy of Sciences,1966-1973.
Senior Research Fellow, Central Economic-Mathematical Institute, U.S.S.R. Academy of Sciences,1963-1965.
Senior Research Fellow, Institute of Economics, U.S.S.R. Academy of Sciences,1960-1963.
Research Fellow, Institute of Economics, U.S.S.R. Academy of Sciences, 1956-1959.
Research Fellow, Institute of Aviation Technology, Moscow, 1956.
Research Fellow, Institute of Ceramics, Moscow,1953-55.
Teacher at Booksale Vocational School, Moscow, 1951-1952.
Consultant at the Collector of Public Libraries, Moscow, 1951.
Planner, "Freser" factory, Moscow, 1950-1951.
Planner, "Kaliber" factory, Moscow,1949.