Worked at the Polytechnical Institute, 1916-1937, and the Physico-Technical Institute, 1925-1929 and 1931-1939 in Leningrad. From 1937, at the Physical Institute of the Academy of Sciences. Worked at the M. Skladovski-Curie Laboratory, Paris, 1929-1931.
Professor at Moscow University, 1940, and Rector of the same university until 1960. Academician, 1946.