Semyon Aranovich Gershgorin

Semyon Aronovich Gershgorin was a Soviet 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. He designed a device for constructing ellipses, a copy of which can be seen in the Deutsches Museum in Munich.