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.
Friedrich Caspar von Geismar Friedrich Caspar von Geismar (also known as Fyodor Geismar, Russian: Фёдор Клементьевич Гейсмар ; 1783-1848) was an Austrian-German military officer who spent the best part of his career in the service of Imperial Russian Army. He eventually rose to the rank of General and became an adjutant to tsar Nicholas I of Russia.