David Abelevich Kaufman (Denis Kaufman; pseudonym Dziga Vertov) was a director, screenwriter, and theoretician of documentary film, one of the creators of its language. He came to Soviet documentary film in 1918, inspired by the ideas of the revolution, and became known as a vivid innovator and experimenter. Vertov’s films One Sixth of the World (1926), Enthusiasm: Symphony of the Donbass (1930), Three Songs about Lenin (1934), and especially Man with a Movie Camera (1929) remain models for generations of documentary filmmakers. His filming practices and theories influenced the cinéma vérité style of documentary moviemaking and the Dziga Vertov Group, a radical filmmaking cooperative which was active in the 1960s.