Hans Walter Conrad Veidt ( 22 January 1893 -- 3 April 1943 ) was a German actor best remembered for his roles in films such as `` The Cabinet of Dr. Caligari '' ( 1920 ) , `` The Man Who Laughs '' ( 1928 ) , and , after being forced to emigrate to Britain by the rise of Nazism in Germany , his English-speaking roles in `` The Thief of Bagdad '' ( 1940 ) , and , in Hollywood , `` Casablanca '' ( 1942 ) .
Hans Walter Conrad Veidt ( 22 January 1893 -- 3 April 1943 ) was a German actor . He best remembered for his roles in movies such as `` The Cabinet of Dr. Caligari '' ( 1920 ) , `` The Man Who Laughs '' ( 1928 ) , `` The Thief of Bagdad '' ( 1940 ) , and in `` Casablanca '' ( 1942 ) .