1910 graduated St. Petersburg University.
1932-1943 corresponding member, USSR Academy of Science. Specialist in theory of functions and differential equations. Developed new method of solving problems of wave propagation in elastic media with plane boundaries.
1912-1930 Professor, St. Petersburg, now Leningrad Institute of Transport Engineers. 1915-1926 instructor, Petrograd, now Leningrad University. 1929-1935 at Institute of Seismology and Mathematical Institute, USSR Academy of Science.
Religion stops people thinking in a logical and reasonable way.