Professor, Department of Slavic Languages and Literatures and Program of Indo-European Studies, University of California, Los Angeles, December 1991 - present. Professor, Department of Slavic Languages and Literatures, Stanford University, August 1990-November 1991. Leading Research Fellow of the Institute of Slavic and Balkan Studies, Russian Academy of Sciences, Moscow, 1989- to present. Director of the Research Institute of World Culture of the Moscow Lomonosov State University, 1992 –to present. Chair, The Department of Theory and History of World Culture and Professor, Philosophical Faculty, Moscow State University, 1989 - April, 1995. Director of the All-Union Library of Foreign Literature, Moscow, December 1989 to October, 1993. Chair, The Department of Structural Typology, Institute of Slavic and Balkan Studies, Academy of Sciences of the USSR, Moscow, 1963 - December, 1989. Professor, Archival and Historical Institute, Moscow, 1988- 1989. Associate Professor, High Courses for the Cinema Scriptwriters, Moscow, 1965 - 1974. Senior Research Fellow, Institute of Slavic and Balkan Studies, Academy of Sciences of the USSR, Moscow, 1961 - 1963. Chair, The Research Group for Automatic Translation, Institute of Computer Technology and Exact Mechanics, Academy of Sciences of the USSR,Moscow, 1959 - 1961. Assistant Professor, Department of General Linguistics / Laboratory for Automatic Translation, State Pedagogical Institute for Foreign Languages, Moscow, 1959-1961. Senior Lecturer(1954 - 1958), Assistant Professor (1958 – 1959), Department of General and Comparative Linguistics, Moscow State University. Research Fellow, Laboratory of Electronic Engineering Models, Academy of Sciences of the USSR, 1957 - 1959.