Assistant department Polish languages Warsaw University, 1950-1956, professor department slavic studies, since 1982, chairman department, since 1993. Adjunct Research Center Slavic Studies, Polish Academy of Sciences, Warsaw, 1956-1968, director, 1974-1982. Professor department Polish language Polish Academy of Sciences, Cracow, since 1996.
Deputy dean faculty Polish philology Warsau University, 1985-1990.
Member Polish Linguistic Society, Polish Academy of Sciences (linguistic committee since 1967, deputy chairman 1975-1984, chairman 1991-1996, member committee for Slavic studies since 1975), Warsaw Science Society, International Committee Slavists (deputy chairman 1991-1993, chairman since 1993), Society Bulgarian Philology, Czech Linguistic Association.
1956 - 1968