He was the son of a Jewish timber merchant and factory owner, Felix Vallentin.

In the 1931 film version of Der Hauptmann von Köpenick, he played the uniform tailor Adolph Wormser.

[2] The seizure of power by the Nazis in 1933, ended his film career abruptly.

In 1933 Vallentin, emigrated to Czechoslovakia, where he appeared on German language stages in Ústí and Prague.

In Tel Aviv, he lectured, read poetry and was a sporadic anchorman for German-language news on the Palestine Broadcasting Service (PBS).