 Kridl was a research associate at the Council on Foreign Relations, New York City, 1953-1962, and a professor of Russian history at Hunter College, City University of New York, 1973-1974.She was a research assistant at the European Institute, Columbia University, 1962-1972, and an assistant curator for Russian archives, 1975-1978.She has been a resident scholar at the Harriman Institute since 1981 and professor of political science 1982—2000.