Credits

• 1972 · Hollywood: The Dream Factory as Self (archive footage)
• 1966 · Way... Way Out as Russian Delegate
• 1966 · The Fortune Cookie as Professor Winterhalter
• 1966 · The Last of the Secret Agents? as Prof. Werner von Koenig
• 1966 · Doom of Dracula as The Burgomaster
• 1965 · Hank as
• 1964 · 36 Hours as German Guard
• 1964 · Daniel Boone as Van Coot
• 1964 · The Addams Family as Eric Von Bissell
• 1964 · Robin and the 7 Hoods as Hammacher (uncredited)
• 1963 · The Danny Kaye Show as Self
• 1963 · Petticoat Junction as Professor Lieberschmit
• 1961 · One, Two, Three as Count von Droste Schattenburg (voice) (uncredited)
• 1961 · The Errand Boy as Baron Elston Carteblanche
• 1960 · Pete and Gladys as
• 1959 · The Many Loves of Dobie Gillis as
• 1959 · Johnny Staccato as
• 1959 · One Step Beyond as Franz Schuldorf
• 1958 · Lawman as
• 1957 · Maverick as
• 1957 · Maverick as Capt. Steeger
• 1957 · The Wings of Eagles as Manager
• 1956 · The Dinah Shore Chevy Show as Self
• 1955 · Spy Chasers as King Rinko
• 1955 · Many Rivers to Cross as Spectacle Man
• 1955 · Carolina Cannonball as Stefan
• 1954 · 3 Ring Circus as Fritz Schlitz
• 1954 · White Christmas as Landlord (uncredited)
• 1954 · Living It Up as Dr. Emile Egelhofer
• 1954 · The Glenn Miller Story as W. Kranz
• 1953 · The Girl on The Roof as
• 1953 · Houdini as Schultz
• 1953 · Stalag 17 as Sgt. Johann Sebastian Schulz
• 1953 · Private Secretary as
• 1953 · General Electric Theater as Dr. Haegendorff
• 1952 · Ma and Pa Kettle on Vacation as Cyrus Kraft
• 1952 · The World in His Arms as General Ivan Vorashilov
• 1952 · O. Henry's Full House as Menkie (segment "The Gift of the Magi") (uncredited)
• 1951 · On the Riviera as Gapeaux
• 1950 · Father Is a Bachelor as Jericho Schlosser
• 1949 · Border Incident as Hugo Wolfgang Ulrich
• 1948 · The Emperor Waltz as Dr. Zwieback
• 1948 · Give My Regards to Broadway as Arthur Dinkel
• 1948 · If You Knew Susie as Count Alexis
• 1947 · Mother Wore Tights as Papa
• 1946 · Faithful in My Fashion as Professor Boris Riminoffsky
• 1946 · Night and Day as Wilowski
• 1946 · A Night in Casablanca as Count Pfefferman / Heinrich Stubel
• 1945 · The Dolly Sisters as Ignatz Tsimmis
• 1945 · She Went to the Races as Dr. Gurke
• 1945 · Men in Her Diary as Mme. Irene
• 1945 · A Royal Scandal as General Ronsky
• 1944 · House of Frankenstein as Burgomeister Hussman
• 1944 · Summer Storm as Kuzma
• 1944 · The Hitler Gang as General von Hindenburg
• 1944 · It Happened Tomorrow as Mr. Beckstein
• 1943 · The Song of Bernadette as Louis Bouriette
• 1943 · Government Girl as Ambassador
• 1943 · Sweet Rosie O'Grady as Joe Flugelman
• 1943 · They Came to Blow Up America as Dr. Herman Holger
• 1943 · Tarzan Triumphs as Sergeant
• 1942 · China Girl as Jarubi
• 1942 · Desperate Journey as Preuss
• 1942 · Berlin Correspondent as Dr. Dietrich
• 1942 · Enemy Agents Meet Ellery Queen as Heinrich, Spy Leader
• 1942 · Crossroads as Dr. Alex Dubroc
• 1942 · To Be or Not to Be as Col. Ehrhardt
• 1942 · Remember Pearl Harbor as Dirk Van Hoorten
• 1941 · Breakdowns of 1941 as Self (archive footage) (uncredited)
• 1941 · This Woman Is Mine as John Jacob Astor
• 1941 · World Premiere as Franz von Bushmaster
• 1941 · Shining Victory as Professor Herman Von Reiter
• 1941 · Love Crazy as Dr. Wuthering
• 1941 · The Wagons Roll at Night as Hoffman the Great
• 1941 · That Uncertain Feeling as Kafka (as Sig Rumann)
• 1941 · The Man Who Lost Himself as Dr. Simms (as Sig Rumann)
• 1941 · So Ends Our Night as Ammers
• 1940 · Victory as Mr. Schomberg
• 1940 · Comrade X as Emil Von Hofer
• 1940 · Bitter Sweet as Herr Schlick
• 1940 · Four Sons as Newmann
• 1940 · I Was an Adventuress as Herr Protz
• 1940 · Outside the Three-Mile Limit as Van Cleve
• 1940 · Dr. Ehrlich's Magic Bullet as Dr. Hans Wolfert
• 1939 · Remember? as Dr. Schmidt
• 1939 · Ninotchka as Comrade Iranoff
• 1939 · Only Angels Have Wings as Dutchy
• 1939 · Confessions of a Nazi Spy as Krogman
• 1939 · Never Say Die as Poppa Ingleborg
• 1939 · Honolulu as Psychiatrist
• 1938 · The Great Waltz as Wertheimer
• 1938 · Suez as Sergeant Pellerin
• 1938 · Girls on Probation as Roger Heath
• 1938 · I'll Give a Million as Anatole Primerose
• 1938 · Paradise for Three as Mr. Bold
• 1938 · The Saint in New York as Hutch Rellin
• 1937 · Thank You, Mr. Moto as Colonel Tchernov
• 1937 · Nothing Sacred as Dr. Emil Eggelhoffer
• 1937 · Heidi as Police Captain
• 1937 · Lancer Spy as Lt. Col. Gottfried Hollen
• 1937 · Thin Ice as Prime Minister
• 1937 · Love Under Fire as General Montero
• 1937 · Think Fast, Mr. Moto as Nicolas Marloff
• 1937 · A Day at the Races as Dr. Leopold X. Steinberg
• 1937 · This Is My Affair as Gus
• 1937 · The Great Hospital Mystery as Dr. Taggert
• 1937 · Midnight Taxi as John B. Rudd
• 1937 · Maytime as Fanchon (as Sig Rumann)
• 1937 · Seventh Heaven as Durand (as Sig Rumann)
• 1937 · On the Avenue as Herr Hanfstangel
• 1936 · The Bold Caballero as Commandante Sebastian Golle
• 1936 · The Princess Comes Across as Steindorf
• 1935 · East of Java as Hans Muller
• 1935 · A Night at the Opera as Gottlieb
• 1935 · The Farmer Takes a Wife as Blacksmith (as Siegfried Rumann)
• 1935 · Spring Tonic as Matt Conklin
• 1935 · The Wedding Night as Mr. Jan Novak
• 1935 · Under Pressure as Doctor
• 1934 · Marie Galante as Brogard
• 1934 · Servants' Entrance as Hans Hansen (as Siegfried Rumann)
• 1934 · The World Moves On as Baron von Gerhardt (as Siegfried Rumann)
• 1929 · Die Königsloge as Bailiff
• 1929 · Lucky Boy as Bridge player (Unbilled)