He was involved in the German Expressionist film movement during the silent era as the head of production at Decla, Decla-Bioscop and from 1924 to 1926 at Ufa responsible for many of the best known movies of the Weimar Republic such as "The Cabinet of Dr. Caligari" (1920), "Dr. Mabuse, the Gambler" (1922), "Die Nibelungen" (1924), "Michael" (1924), "Der Letzte Mann / The Last Laugh" (1924), "Variety" (1925), "Tartuffe" (1926), "Manon Lescaut" (1926) "Faust" (1926), "Metropolis" (1927) and "The Blue Angel" (1930).
Он отвечал за съемки многих известных картин Веймарской республики — "The Cabinet of Dr. Caligari" («Кабинет доктора Калигари», 1920), "Dr. Mabuse, der Spieler" («Доктор Мабузе, игрок», 1922), "Die Nibelungen" («Нибелунги», 1924), "Mikaël" (1924), "Der Letzte Mann/The Last Laugh" («Последний_человек», 1924), "Varieté" (1925), "Herr Tartüff" (1926), "Faust" («Фауст», 1926), "Metropolis" («Метрополис», 1927) и "Der Blaue Engel" («Голубой ангел», 1930).