Semyon Aranovich Gershgorin and Vladimir Berkovich, have which occupation?
Semyon Aranovich Gershgorin Semyon Aronovich Gershgorin (August 24, 1901 – May 30, 1933) was a Soviet (born in Pruzhany, Belarus, Russian Empire) mathematician. He began as a student at the Petrograd Technological Institute in 1923, became a Professor in 1930, and was given an appointment at the Leningrad Mechanical Engineering Institute in the same year. His contributions include the Gershgorin circle theorem.
Vladimir Zenzinov Vladimir Mikhailovich Zenzinov (Russian: Владимир Михайлович Зензинов ; historically, his surname was also transcribed as Sensinoff: 29 November 1880 — 20 October 1953) was a member of Russia's Socialist-Revolutionary Party, a participant of the First (1905), Second (February 1917), and Third (November 1917) Russian Revolutions, and an author of a number of books.