P. Koshevoy studied in Moscow at the Lunacharsky United Workers' Faculty of Arts during 1928-1931. He graduated from the Leningrad Academy of Arts (A.I. Savinov's studio) in 1937. He was an instructor at the Moscow Art School for Gifted Children since 1938. He acquired a status of an assistant professor at the Arts Department of the Moscow Polygraphic Institute in 1940 (by recommendation of a Peoples' Artist of the USSR B. Joganson). He participated regularly in the All-Union and Republican exhibitions since 1934: "The15^th Anniversary of the All-Union Leninist Young Communist League" (Moscow, 1934). His  personal exhibition took place in Leningrad (1937). "The 20^th Anniversary of the All-Union Leninist Young Communist League" (Moscow, 1939); "The Exhibition of Soviet Film Posters" (Moscow, 1960). Works of the artist are kept in the State Tretyakov's Gallery; the Central Museum of V.I. Lenin; the State Museum of Revolution; etc.