Kosek was born in Brno, at the end of the war he returned with his mother, a native of Prague, to Prague, from where the family was evicted in 1951 for political reasons. Kosk was not allowed to study, trained as a typesetter in Turnov and then worked as a laborer at the main railway station in Prague, later as a setter at the National Theater.
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In the relaxed 1960s, he got to DAMU, where he studied directing. He then worked externally for television in Prague and Ostrava, where he left in 1975. Until 1989, Kosek made mainly television films and productions, such as Záviš and Kunhuta, and also starred in the series Without a Woman and Without Tobacco (1980).
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After the Velvet Revolution, he became the director of the ČT Ostrava program. He also lectured on television production and TV ethics at the Silesian University in Opava. In 1995, he returned to Prague, where he worked for the newspapers Slovo and Metro. He was also one of the directors of the series Streets on TV Nova.
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