Education
1910 graduate Moscow University.
1910 graduate Moscow University.
1914-1926 assistant professor, 1926-1930 associate professor, from 1930 professor, Moscow University. Specialized in the taxonomy and faunistics of mammals. Wrote numerous popular works and textbooks on vertebrate zoology for secondary schools and higher educational establishments.
Wrote a complete description of the mammals of the Union of the Soviet Socialist Republics.