Stamboul Quest

(1934)

Karl (as Rudolph Amendt)

The Fountain

(1934)

Geof Van Leyden

Hell in the Heavens

(1934)

Lt. Schroeder (as Rudolph Amendt)

Last of the Pagans

(1935)

Superintendant's Assistant (uncredited)

Here's to Romance

(1935)

Violinist

Rendezvous

(1935)

Radio Operator (uncredited)

We're in the Legion Now

(1936)

Sgt. Groeber

Champagne Waltz

(1937)

Emperor Franz Joseph

That Mothers Might Live

(1938)

Doctor (uncredited)

Espionage Agent

(1939)

Paul Strawn (as Robert O. Davis)

Pack Up Your Troubles

(1939)

Von Richtman

Confessions of a Nazi Spy

(1939)

Captain Straubel

Escape to Paradise

(1939)

Alexander Komac

The Mad Empress

(1939)

Herzfeld

The Great Dictator

(1940)

Tomanian Commandant at Osterlich / Robert O. Davis

The Mortal Storm

(1940)

Gestapo Official Hartman

Arise, My Love

(1940)

Prussian Officer (Uncredited)

Knute Rockne All American

(1940)

Elder in Norway (uncredited)

The Man I Married

(1940)

Storm Trooper

Meet the Wildcat

(1940)

Feral--Henchman

King of the Texas Rangers

(1941)

His Excellency

Down in San Diego

(1941)

Henry Schrode

Underground

(1941)

Official

A Dangerous Game

(1941)

Dr. Fleming

Mr. Dynamite

(1941)

Frederick the Butler

The Phantom Plainsmen

(1942)

Colonel Eric Hartwig (as Robert O. Davis)

Spy Smasher

(1942)

Col. Von Kohr

The Secret Code

(1942)

Rudi Thysson

Junior Army

(1942)

Horner - Nazi Saboteur (as Robert O. Davis)

Riders of the Northland

(1942)

Agent (as Robert O. Davis)

The Devil with Hitler

(1942)

Nazi Officer at Hitler's filmed Speech (uncredited)

Eagle Squadron

(1942)

German Squad Leader

The Great Impersonation

(1942)

Karl Hofmann

Desperate Journey

(1942)

Kruse

To Be or Not to Be

(1942)

Gestapo Sergeant at Desk at Top of Hotel Stairs (uncredited)

Sherlock Holmes and the Secret Weapon

(1942)

Braun (uncredited)

The Pied Piper

(1942)

Lieutenant

Nazi Agent

(1942)

Cab Driver (uncredited)

Counter-Attack

(1945)

Stillman

Escape in the Desert

(1945)

Hoffman

Under Nevada Skies

(1946)

Alberti

Dangerous Millions

(1946)

Rudolph Busch

Act of Violence

(1949)

German (voice) (uncredited)

Kill or Be Killed

(1950)

Gregory Marek

Target Unknown

(1951)

Doctor (uncredited)

South Sea Woman

(1953)

Capt. van Dorck

Captain Scarface

(1953)

Dr. Yeager

Phantom from Space

(1953)

Dr. Wyatt

Magnificent Obsession

(1954)

Dr. Albert Fuss

Jungle Gents

(1954)

Dr. Goebbel

The Snow Creature

(1954)

Dr. Louis DuPont

Silver Needle in the Sky

(1954)

Dr. Loran

A Star Is Born

(1954)

Mr. Ettinger (uncredited)

King Richard and the Crusaders

(1954)

Austrian Knight (uncredited)

She Demons

(1958)

Col. Karl Osler

Frankenstein 1970

(1958)

Wilhelm Gottfried

A Private's Affair

(1959)

Dr. Leyden

On the Double

(1961)

Oberkommandant

The Pigeon That Took Rome

(1962)

Col. Wilhelm Krafft

The Prize

(1963)

Mr. Rolfe Bergh - Chaperon

Decision at Midnight

(1963)

Spy Smasher Returns

(1966)

Col. Von Kahr

Horrible Horror

(1986)

Colonel Karl Osler in 'She Demons'