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.