The ultimate aim of all science to penetrate the unknown. Do you realize we know less about the earth we live on than about the stars and the galaxies of outer space? The greatest mystery is right here, right under our feet.

Selected filmography
The Flute Concert of Sans-Souci (1930)
Episode (1935)
The Divine Spark (1935)
The Great Waltz (1938)
Ninotchka (1939)
My Love Came Back (1940)
Comrade X (1940) (story)
That Hamilton Woman (1941)
That Uncertain Feeling (1941)
The Heavenly Body (1944)
Gaslight (1944)
Song of Scheherazade (1947)
The Mating Season (1951)
The Model and the Marriage Broker (1951)
Titanic (1953)
Die Mücke (1954)
Teenage Rebel (1956)
Journey to the Center of the Earth (1959)
Ninotchka (1939). He also wrote lyrics to several songs featured in his films one popular title is "Flieger grüß mir die Sonne".

He also wrote lyrics to several songs featured in his films one popular title is "Flieger grüß mir die Sonne".