1902 graduated Paris University. Studied at Goettingen University, Germany.
Specialist in theory of differential equations and theory of probability. Created theory of functions and applied probability theory to physics and statistics. 1924-1929 corresponding member, USSR Academy of Science.
Since 1940 honorary member, Moscow Mathematical Society. Since 1944 Honoured Doctor, Algiers University. Since 1945 Honoured Doctor, Paris University.
Since 1955 member, Prague Academy of Sciences. 1907-1920 instructor and 1920-1933 Professor, Kharkov University. 1933-1941 Professor, Leningrad Polytechn.
Institute, 1934-1941 Professor, Leningrad University.
Religion is bad because it gets people to believe something untrue.