The seizure of power by the National Socialists 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 1938 he left for Switzerland and worked at the Stadttheater Basel and the Schauspielhaus Zürich. In 1939 he emigrated to Mandatory Palestine and settled in Tel Aviv. Not being able to speak Hebrew, he retired from acting altogether. In Tel Aviv, he lectured, read poetry and was a sporadic anchorman for German-language news on the Palestine Broadcasting Service (PBS). He died in Tel Aviv in 1945, aged 73.
