Hungarian film theorist and screenwriter. A committed Marxist, he left Hungary in 1919. In Berlin from 1926, he was associated with leftist stage and film projects and worked closely with
Bertolt Brecht,
Georg Wilhelm Pabst and
Erwin Piscator. Worked in Russia as a professor between 1931-45, returning to Hungary after the war to help rebuild the film industry there. A studio in Budapest for young experimental filmmakers was later named in his honor.
