Despite his family's objections, he went to study at the Aleksander Ostrovsky Theater and Art Academy in Tashkent.
Though located in the remote Uzbek SSR, the academy's staff consisted of some of the Soviet Union's best dramatists, who moved in there from Moscow and Leningrad after being blacklisted as rootless cosmopolitans during Andrei Zhdanov's artistic purges.
[2] Seidenberg moved to the Odesa Russian Theater at 1962, where he performed a wide range of characters; his appearances as Mercutio in Romeo and Juliet were especially praised by critics.
He also held the tenure of an associate professor in the municipal Antonina Nezhdanova Conservatory's opera department.
[5] He made his debut on screen as cavalryman Emelyanov in the 1965 film Viper, based on the 1928 eponymous novel by Aleksey Nikolayevich Tolstoy.