Self (archive footage)
Hollywood: The Dream Factory (1972)
Russian Delegate
Way... Way Out (1966)
Professor Winterhalter
Ένας υπέροχος απατεώνας (1966)
Prof. Werner von Koenig
The Last of the Secret Agents? (1966)
The Burgomaster
Doom of Dracula (1966)
German Guard
36 Ώρες πριν από τη Μεγάλη Απόβαση (1964)
Hammacher (uncredited)
Ο Ρομπέν και τα 7 Παλικάρια του (1964)
Count von Droste Schattenburg (voice) (uncredited)
One, Two, Three (1961)
Baron Elston Carteblanche
The Errand Boy (1961)
Manager
The Wings of Eagles (1957)
King Rinko
Spy Chasers (1955)
Spectacle Man
Many Rivers to Cross (1955)
Stefan
Carolina Cannonball (1955)
Fritz Schlitz
3 Ring Circus (1954)
Landlord (uncredited)
Λευκά Χριστούγεννα (1954)
Dr. Emile Egelhofer
Living It Up (1954)
W. Kranz
The Glenn Miller Story (1954)
Die Jungfrau auf dem Dach (1953)
Schultz
Houdini (1953)
Sgt. Johann Sebastian Schulz
Ο Καταδότης του Θαλάμου 17 (1953)
Cyrus Kraft
Ma and Pa Kettle on Vacation (1952)
General Ivan Vorashilov
Ο κυρίαρχος του κόσμου (1952)
Menkie (segment "The Gift of the Magi") (uncredited)
Το τελευταίο φύλλο (1952)
Gapeaux
On the Riviera (1951)
Jericho Schlosser
Father Is a Bachelor (1950)
Hugo Wolfgang Ulrich
Border Incident (1949)
Dr. Zwieback
The Emperor Waltz (1948)
Arthur Dinkel
Give My Regards to Broadway (1948)
Count Alexis
If You Knew Susie (1948)
Papa
Mother Wore Tights (1947)
Professor Boris Riminoffsky
Faithful in My Fashion (1946)
Wilowski
Night and Day (1946)
Count Pfefferman / Heinrich Stubel
Μία Νύχτα στην Καζαμπλάνκα (1946)
Ignatz Tsimmis
The Dolly Sisters (1945)
Dr. Gurke
She Went to the Races (1945)
Mme. Irene
Men in Her Diary (1945)
General Ronsky
A Royal Scandal (1945)
Burgomeister Hussman
House of Frankenstein (1944)
Kuzma
Summer Storm (1944)
General von Hindenburg
The Hitler Gang (1944)
Mr. Beckstein
Συνέβη αύριο (1944)
Louis Bouriette
Ουράνια Οπτασία (1943)
Ambassador
Government Girl (1943)
Joe Flugelman
Sweet Rosie O'Grady (1943)
Dr. Herman Holger
They Came to Blow Up America (1943)
Sergeant
Ο Θρίαμβος του Ταρζάν (1943)
Jarubi
China Girl (1942)
Preuss
Ηρωική Εξόρμησις (1942)
Dr. Dietrich
Berlin Correspondent (1942)
Heinrich, Spy Leader
Enemy Agents Meet Ellery Queen (1942)
Dr. Alex Dubroc
Crossroads (1942)
Col. Ehrhardt
Να ζει κανείς ή να μη ζει (1942)
Dirk Van Hoorten
Remember Pearl Harbor (1942)
Self (archive footage) (uncredited)
Breakdowns of 1941 (1941)
John Jacob Astor
This Woman Is Mine (1941)
Franz von Bushmaster
World Premiere (1941)
Professor Herman Von Reiter
Shining Victory (1941)
Dr. Wuthering
Love Crazy (1941)
Hoffman the Great
The Wagons Roll at Night (1941)
Kafka (as Sig Rumann)
That Uncertain Feeling (1941)
Dr. Simms (as Sig Rumann)
The Man Who Lost Himself (1941)
Ammers
So Ends Our Night (1941)
Mr. Schomberg
Victory (1940)
Emil Von Hofer
Comrade X (1940)
Herr Schlick
Bitter Sweet (1940)
Newmann
Four Sons (1940)
Herr Protz
I Was an Adventuress (1940)
Van Cleve
Outside the Three-Mile Limit (1940)
Dr. Hans Wolfert
Dr. Ehrlich's Magic Bullet (1940)
Dr. Schmidt
Remember? (1939)
Comrade Iranoff
Νινότσκα (1939)
Dutchy
Only Angels Have Wings (1939)
Krogman
Confessions of a Nazi Spy (1939)
Poppa Ingleborg
Never Say Die (1939)
Psychiatrist
Honolulu (1939)
Wertheimer
The Great Waltz (1938)
Sergeant Pellerin
Suez (1938)
Roger Heath
Girls on Probation (1938)
Anatole Primerose
I'll Give a Million (1938)
Mr. Bold
Paradise for Three (1938)
Hutch Rellin
The Saint in New York (1938)
Colonel Tchernov
Thank You, Mr. Moto (1937)
Dr. Emil Eggelhoffer
Nothing Sacred (1937)
Police Captain
Heidi (1937)
Lt. Col. Gottfried Hollen
Lancer Spy (1937)
Prime Minister
Thin Ice (1937)
General Montero
Love Under Fire (1937)
Nicolas Marloff
Think Fast, Mr. Moto (1937)
Dr. Leopold X. Steinberg
Μια Μέρα στον Ιππόδρομο (1937)
Gus
This Is My Affair (1937)
Dr. Taggert
The Great Hospital Mystery (1937)
John B. Rudd
Midnight Taxi (1937)
Fanchon (as Sig Rumann)
Maytime (1937)
Durand (as Sig Rumann)
Seventh Heaven (1937)
Herr Hanfstangel
On the Avenue (1937)
Commandante Sebastian Golle
The Bold Caballero (1936)
Steindorf
The Princess Comes Across (1936)
Hans Muller
East of Java (1935)
Gottlieb
Μια Νύχτα στην Όπερα (1935)
Blacksmith (as Siegfried Rumann)
The Farmer Takes a Wife (1935)
Matt Conklin
Spring Tonic (1935)
Mr. Jan Novak
The Wedding Night (1935)
Doctor
Under Pressure (1935)
Brogard
Marie Galante (1934)
Hans Hansen (as Siegfried Rumann)
Servants' Entrance (1934)
Baron von Gerhardt (as Siegfried Rumann)
The World Moves On (1934)
Bailiff
Die Königsloge (1929)
Bridge player (Unbilled)
Lucky Boy (1929)