Question: Semyon Aranovich Gershgorin and Vladimir Berkovich, have which occupation?

Context paragraphs:
Rafferty (1980 TV series): Rafferty or (Russian: Рафферти , "Rafferty " ) is a Soviet 1980 drama television film directed by Semyon Aranovich and based on the novel by American writer Lionel White.

Semyon Aranovich: Semyon Davidovich Aranovich (Ukrainian: Семён Аранович, 23 July 1934, Derazhnya, Ukraine, Soviet Union – 8 September 1996, Hamburg, Germany) was a Soviet and Russian film director.

The Year of the Dog (film): The Year of the Dog (Russian: Год собаки , "God sobaki " ) is a 1994 Russian drama film directed by Semyon Aranovich.  It was entered into the 44th Berlin International Film Festival where it won the Silver Bear for an outstanding artistic contribution.

Confrontation (TV series): Confrontation or (Russian: Противостояние , "Protivostoyanie " ) is a 1985 Soviet six-part television film directed by Semyon Aranovich based on the novel by Yulian Semyonov.

Gershgorin circle theorem: In mathematics, the Gershgorin circle theorem may be used to bound the spectrum of a square matrix.  It was first published by the Soviet mathematician Semyon Aronovich Gershgorin in 1931.  The spelling of S. A. Gershgorin's name has been transliterated in several different ways, including Geršgorin, Gerschgorin, Gershgorin, Hershhorn, and Hirschhorn.

Vladimir Berkovich: Vladimir Berkovich is a mathematician at the Weizmann Institute of Science who introduced Berkovich spaces. His Ph.D. advisor was Yuri I. Manin.  Berkovich was a visiting scholar at the Institute for Advanced Study in 1991-92 and again in the summer of 2000.

Semyon Bagdasarov: Semyon Arkadyevich Bagdasarov (Russian: Семён Арка́дьевич Багдаса́ров ; born November 20, 1954 in Margilan, Uzbek SSR) is a pro-Armenian Russian politician and member of the State Duma of the Russian Federation.  He is a member of A Just Russia.  According to Vladimir Zhirinovsky, he prioritizes the interests of Armenia in the political discussions in Russia.

The Forest (1953 film): The Forest (Russian: Лес , "Les " ) is a 1953 Soviet drama film directed by Semyon Timoshenko and Vladimir Vengerov.

Volodymyr Bahaziy: Volodymyr (Vladimir, Wladimir) Panteleimonovych Bahasiy (Bagaziy, Bagasij, Bahasij), Ukrainian: "Вoлoдимир Пантелеймонович Багазiй" (1902, Ryabovka village, Ukraine — 21 February 1942, Kiev, Babyn Yar) was a Ukrainian nationalist affiliated with the Andriy Melnyk's faction of the Organization of Ukrainian Nationalists and head of Kiev City Administration under German occupation in October 1941 - January 1942.

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.

Supporting paragraphs: Semyon Aranovich Gershgorin Vladimir Berkovich
Answer: mathematician