Colonel Karl Osler in 'She Demons'
Horrible Horror (1986)
Col. Von Kahr
Spy Smasher Returns (1966)
Mr. Rolfe Bergh - Chaperon
The Prize (1963)
Decision at Midnight (1963)
Col. Wilhelm Krafft
The Pigeon That Took Rome (1962)
Oberkommandant
On the Double (1961)
Dr. Leyden
A Private's Affair (1959)
Wilhelm Gottfried
Frankenstein 1970 (1958)
Col. Karl Osler
She Demons (1958)
Dr. Louis DuPont
The Snow Creature (1954)
Mr. Ettinger (uncredited)
A Star Is Born (1954)
Dr. Goebbel
Jungle Gents (1954)
Dr. Albert Fuss
Magnificent Obsession (1954)
Austrian Knight (uncredited)
King Richard and the Crusaders (1954)
Dr. Loran
Silver Needle in the Sky (1954)
Dr. Yeager
Captain Scarface (1953)
Capt. van Dorck
South Sea Woman (1953)
Dr. Wyatt
Phantom from Space (1953)
Doctor (uncredited)
Target Unknown (1951)
Gregory Marek
Kill or Be Killed (1950)
German (voice) (uncredited)
Act of Violence (1949)
Rudolph Busch
Dangerous Millions (1946)
Alberti
Under Nevada Skies (1946)
Hoffman
Escape in the Desert (1945)
Stillman
Counter-Attack (1945)
Braun (uncredited)
Sherlock Holmes and the Secret Weapon (1942)
Karl Hofmann
The Great Impersonation (1942)
Horner - Nazi Saboteur (as Robert O. Davis)
Junior Army (1942)
Nazi Officer at Hitler's filmed Speech (uncredited)
The Devil with Hitler (1942)
Kruse
Desperate Journey (1942)
Rudi Thysson
The Secret Code (1942)
Lieutenant
The Pied Piper (1942)
Agent (as Robert O. Davis)
Riders of the Northland (1942)
Colonel Eric Hartwig (as Robert O. Davis)
The Phantom Plainsmen (1942)
German Squad Leader
Eagle Squadron (1942)
Col. Von Kohr
Spy Smasher (1942)
Gestapo Sergeant at Desk at Top of Hotel Stairs (uncredited)
To Be or Not to Be (1942)
Cab Driver (uncredited)
Nazi Agent (1942)
His Excellency
King of the Texas Rangers (1941)
Dr. Fleming
A Dangerous Game (1941)
Henry Schrode
Down in San Diego (1941)
Official
Underground (1941)
Frederick the Butler
Mr. Dynamite (1941)
Prussian Officer (Uncredited)
Arise, My Love (1940)
Feral--Henchman
Meet the Wildcat (1940)
Tomanian Commandant at Osterlich / Robert O. Davis
Diktatoren (1940)
Elder in Norway (uncredited)
Knute Rockne All American (1940)
Storm Trooper
The Man I Married (1940)
Gestapo Official Hartman
The Mortal Storm (1940)
Alexander Komac
Escape to Paradise (1939)
Herzfeld
The Mad Empress (1939)
Von Richtman
Pack Up Your Troubles (1939)
Paul Strawn (as Robert O. Davis)
Espionage Agent (1939)
Captain Straubel
Confessions of a Nazi Spy (1939)
That Mothers Might Live (1938)
Emperor Franz Joseph
Champagne Waltz (1937)
Sgt. Groeber
We're in the Legion Now (1936)
Superintendant's Assistant (uncredited)
Last of the Pagans (1935)
Radio Operator (uncredited)
Rendezvous (1935)
Violinist
Here's to Romance (1935)
Lt. Schroeder (as Rudolph Amendt)
Hell in the Heavens (1934)
Geof Van Leyden
The Fountain (1934)
Karl (as Rudolph Amendt)
Stamboul Quest (1934)