Acted in 72
1960s
- 1967
- 1966
Spy Smasher Returns
Col. Von Kahr
- 1963
The Prize
Mr. Rolfe Bergh - Chaperon
Decision at Midnight
Uncle
- 1962
Saints and Sinners
Otto Masuis · 1 episode
The Pigeon That Took Rome
Col. Wilhelm Krafft
- 1961
On the Double
Oberkommandant
1950s
- 1959
A Private's Affair
Dr. Leyden
- 1958
She Demons
Col. Karl Osler
- 1957
- 1955
- 1954
The Snow Creature
Dr. Louis DuPont
Jungle Gents
Dr. Goebbel
Magnificent Obsession
Dr. Albert Fuss
Silver Needle in the Sky
Dr. Loran
- 1953
Captain Scarface
Dr. Yeager
- 1952
- 1951
Target Unknown
Doctor (uncredited)
- 1950
Kill or Be Killed
Gregory Marek
1940s
- 1949
- 1946
Dangerous Millions
Rudolph Busch
- 1945
Escape in the Desert
Hoffman
Counter-Attack
Stillman
- 1943
- 1942
The Great Impersonation
Karl Hofmann
Junior Army
Horner - Nazi Saboteur (as Robert O. Davis)
The Devil with Hitler
Nazi Officer at Hitler's filmed Speech (uncredited)
Desperate Journey
Kruse
The Secret Code
Rudi Thysson
The Pied Piper
Lieutenant
Riders of the Northland
Agent (as Robert O. Davis)
The Phantom Plainsmen
Colonel Eric Hartwig (as Robert O. Davis)
Eagle Squadron
German Squad Leader
Nazi Agent
Cab Driver (uncredited)
- 1941
King of the Texas Rangers
His Excellency
A Dangerous Game
Dr. Fleming
Down in San Diego
Henry Schrode
Underground
Official
- 1940
Arise, My Love
Prussian Officer (uncredited)
Meet the Wildcat
Feral--Henchman
The Man I Married
Storm Trooper
1930s
- 1939
Escape to Paradise
Alexander Komac
The Mad Empress
Herzfeld
Pack Up Your Troubles
Von Richtman
Espionage Agent
Paul Strawn (as Robert O. Davis)
Confessions of a Nazi Spy
Captain Straubel
- 1938
- 1937
Champagne Waltz
Emperor Franz Joseph
- 1936
We're in the Legion Now
Sgt. Groeber
- 1935
Last of the Pagans
Superintendant's Assistant (uncredited)
Rendezvous
Radio Operator (uncredited)
Here's to Romance
Violinist
- 1934
Hell in the Heavens
Lt. Schroeder (as Rudolph Amendt)
The Fountain
Geof Van Leyden
Stamboul Quest
Karl (as Rudolph Amendt)
