Credits

• 1975 · Film Emigration from Nazi Germany as Self (archive footage)
• 1951 · The Gentleman in Room 6 as Guest
• 1944 · Resisting Enemy Interrogation as Herr Mahler - German Red Cross Representative
• 1943 · First Comes Courage as Nazi Captain (uncredited)
• 1943 · Background to Danger as German Officer
• 1943 · Hitler's Madman as
• 1943 · Hangmen Also Die! as Reinhard Heydrich
• 1943 · Edge of Darkness as German Co-Pilot (uncredited)
• 1943 · Margin for Error as Fritz - Butler
• 1943 · Casablanca as German Officer with Yvonne (uncredited)
• 1942 · Once Upon a Honeymoon as German Officer (uncredited)
• 1942 · The Dawn Express as Capt. Gemmler
• 1939 · Hitler: Beast of Berlin as Albert Stalhelm - Storm Trooper
• 1939 · Espionage Agent as Dr. Helm
• 1939 · Confessions of a Nazi Spy as Helldorf
• 1935 · The Crusades as Nicholas, Count of Hungary
• 1935 · Storm Over the Andes as Oberto (as Hans Von Twardowski)
• 1934 · The Scarlet Empress as
• 1933 · The Devil's in Love as Andre's Defense Counsel
• 1933 · Adorable as Prince of Pontevedro
• 1933 · Private Jones as Von Bergen (uncredited)
• 1932 · 6 Hours to Live as Flosky
• 1932 · Scandal for Sale as Affner, the pilot
• 1931 · The Holy Flames as Robert Taylor
• 1930 · The Singing City as Willi von Wellheim - Claires Verehrer
• 1930 · Ludwig II, King of Bavaria as Otto von Wittelsbach (as H.H. von Twardowsky)
• 1929 · Peter, der Matrose as
• 1929 · I Kiss Your Hand, Madame as Waiter
• 1928 · Sex in Chains as Alfred
• 1928 · Die Hölle der Jungfrauen as
• 1927 · Der falsche Prinz as Wolf, sein Freund
• 1927 · The Weavers as Gottfried Hilse
• 1924 · The Enchantress as
• 1923 · I.N.R.I. – A Film of Humanity as Johannes
• 1922 · Phantom as Hugo Lubota
• 1922 · Marizza as
• 1921 · The House on the Moon as
• 1920 · The Night of Queen Isabeau as Page
• 1920 · Genuine: The Tragedy of a Vampire as Florian
• 1920 · The Cabinet of Dr. Caligari as Alan
• 1920 · From Morn to Midnight as Sohn der Dame
• 1919 · Eerie Tales as Restaurant Waiter