Credits

• 1968 · To Die in Paris as General Ludmer
• 1967 · The Spy in the Green Hat as Dr. Heinrich von Kronen
• 1966 · Too Many Thieves as Bulanerti
• 1966 · Torn Curtain as Gustav Lindt
• 1965 · Branded as
• 1963 · The Fugitive as Dr. Josef Karac
• 1962 · The Merv Griffin Show as Self
• 1961 · Ben Casey as
• 1961 · Cain's Hundred as Hans Saltzman
• 1960 · The Dybbuk as Rabbi Azrael
• 1959 · The Twilight Zone as Ernst Ganz
• 1959 · Judgment at Nuremberg as Dr. Wickert
• 1958 · Naked City as Owner of Pawnshop
• 1958 · Naked City as Stefan
• 1958 · Naked City as Doc Randall Benton
• 1957 · Decoy as Fred
• 1957 · Decoy as 'Knish' Levin
• 1956 · Playhouse 90 as Dr. Wickert
• 1955 · Matinee Theater as
• 1953 · The Veils of Bagdad as Kaffar
• 1953 · Sins of Jezebel as Naboth
• 1952 · My Pal Gus as Karl
• 1952 · Omnibus as
• 1951 · Hallmark Hall of Fame as Joseph
• 1951 · Journey Into Light as 'Doc' Thorssen
• 1951 · Sirocco as Flophouse Proprietor
• 1951 · The Great Caruso as Alfredo Brazzi
• 1950 · Mystery Submarine as Dr. Adolph Guernitz
• 1950 · The Killer That Stalked New York as Dr. Cooper
• 1949 · There's a Girl in My Heart as Professor Joseph Kroner
• 1949 · Jolson Sings Again as Cantor Yoelson
• 1949 · The Great Sinner as Doctor
• 1949 · The Lovable Cheat as Violette
• 1949 · The Fighting O'Flynn as Hendrigg
• 1948 · Studio One as
• 1948 · Sealed Verdict as Jakob Meyersohn
• 1948 · To the Ends of the Earth as Nicholas Sokim
• 1947 · Cigarette Girl as Otto
• 1946 · Blondie Knows Best as Dr. Titus
• 1946 · The Jolson Story as Cantor Yoelson
• 1946 · Renegades as Jackorski
• 1946 · The Devil's Mask as Dr. Karger
• 1946 · Gilda as German Cartel Member
• 1945 · Prison Ship as Professor
• 1945 · Counter-Attack as Mueller
• 1944 · The Master Race as Schmidt (as Louis Donath)
• 1943 · The Strange Death of Adolf Hitler as Adolf Hitler / Franz Huber
• 1943 · Above Suspicion as Gestapo Officer in Schultz's Laboratory (Uncredited)
• 1943 · This Land Is Mine as German Captain
• 1943 · Hangmen Also Die! as Schirmer
• 1943 · Margin for Error as Hitler's Voice
• 1942 · Reunion in France as Desk Clerk in Hotel (uncredited)
• 1942 · Lady from Chungking as Hans Gruber
• 1942 · The Secret Code as Nazi Prof. Metzger
• 1932 · Girls to Marry as
• 1921 · Theodor Herzl, Standard-Bearer of the Jewish People as Prinz Eugen
• Future · He's Alive as Ernst Ganz