Credits · 73
Garrison's Gorillas
1967
FilmSpy Smasher Returns
1966 · Col. Von Kahr
FilmThe Prize
1963 · Mr. Rolfe Bergh - Chaperon
FilmDecision at Midnight
1963 · Uncle
Saints and Sinners
1962 · Otto Masuis
FilmThe Pigeon That Took Rome
1962 · Col. Wilhelm Krafft
FilmOn the Double
1961 · Oberkommandant
The Rebel
1959 · Frank Gottwald
FilmA Private's Affair
1959 · Dr. Leyden
One Step Beyond
1959 · Josef
77 Sunset Strip
1958
FilmFrankenstein 1970
1958 · Wilhelm Gottfried
FilmShe Demons
1958 · Col. Karl Osler
The Walter Winchell File
1957
Alfred Hitchcock Presents
1955 · Cafe Host
FilmThe Snow Creature
1954 · Dr. Louis DuPont
FilmA Star Is Born
1954 · Mr. Ettinger (uncredited)
FilmJungle Gents
1954 · Dr. Goebbel
FilmMagnificent Obsession
1954 · Dr. Albert Fuss
FilmKing Richard and the Crusaders
1954 · Austrian Knight (uncredited)
FilmSilver Needle in the Sky
1954 · Dr. Loran
FilmCaptain Scarface
1953 · Dr. Yeager
FilmSouth Sea Woman
1953 · Capt. van Dorck
FilmPhantom from Space
1953 · Dr. Wyatt
Adventures of Superman
1952 · Dr. Rudolf Albrecht
Dangerous Assignment
1952
FilmTarget Unknown
1951 · Doctor (uncredited)
Space Patrol
1950
FilmKill or Be Killed
1950 · Gregory Marek
FilmAct of Violence
1949 · German (voice) (uncredited)
FilmDangerous Millions
1946 · Rudolph Busch
FilmUnder Nevada Skies
1946 · Alberti
FilmEscape in the Desert
1945 · Hoffman
FilmCounter-Attack
1945 · Stillman
FilmWatch on the Rhine
1943 · Oberdorff
FilmSherlock Holmes and the Secret Weapon
1942 · Braun (uncredited)
FilmThe Great Impersonation
1942 · Karl Hofmann
FilmJunior Army
1942 · Horner - Nazi Saboteur (as Robert O. Davis)
FilmThe Devil with Hitler
1942 · Nazi Officer at Hitler's filmed Speech (uncredited)
FilmDesperate Journey
1942 · Kruse
FilmThe Secret Code
1942 · Rudi Thysson
FilmThe Pied Piper
1942 · Lieutenant
FilmRiders of the Northland
1942 · Agent (as Robert O. Davis)
FilmThe Phantom Plainsmen
1942 · Colonel Eric Hartwig (as Robert O. Davis)
FilmEagle Squadron
1942 · German Squad Leader
FilmSpy Smasher
1942 · Col. Von Kohr
FilmTo Be or Not to Be
1942 · Gestapo Sergeant at Desk at Top of Hotel Stairs (uncredited)
FilmNazi Agent
1942 · Cab Driver (uncredited)
FilmKing of the Texas Rangers
1941 · His Excellency
FilmA Dangerous Game
1941 · Dr. Fleming
FilmDown in San Diego
1941 · Henry Schrode
FilmUnderground
1941 · Official
FilmMr. Dynamite
1941 · Frederick the Butler
FilmArise, My Love
1940 · Prussian Officer (uncredited)
FilmMeet the Wildcat
1940 · Feral--Henchman
FilmThe Great Dictator
1940 · Tomanian Commandant at Osterlich / Robert O. Davis
FilmKnute Rockne All American
1940 · Elder in Norway (uncredited)
FilmThe Man I Married
1940 · Storm Trooper
FilmThe Mortal Storm
1940 · Gestapo Official Hartman
FilmEscape to Paradise
1939 · Alexander Komac
FilmThe Mad Empress
1939 · Herzfeld
FilmPack Up Your Troubles
1939 · Von Richtman
FilmEspionage Agent
1939 · Paul Strawn (as Robert O. Davis)
FilmConfessions of a Nazi Spy
1939 · Captain Straubel
FilmThat Mothers Might Live
1938 · Doctor (uncredited)
FilmChampagne Waltz
1937 · Emperor Franz Joseph
FilmWe're in the Legion Now
1936 · Sgt. Groeber
FilmLast of the Pagans
1935 · Superintendant's Assistant (uncredited)
FilmRendezvous
1935 · Radio Operator (uncredited)
FilmHere's to Romance
1935 · Violinist
FilmHell in the Heavens
1934 · Lt. Schroeder (as Rudolph Amendt)
FilmThe Fountain
1934 · Geof Van Leyden
FilmStamboul Quest
1934 · Karl (as Rudolph Amendt)