His real name was Theodor Friedrich Emil Janenz, and in the early 1900s, he was already working in the theater under Max Reinhardt 's company. Important movies where he defined himself as a convincing actor were Madame DuBarry (1919) and Quo Vadis? (1924), followed by Der letzte Mann (1924)(aka The Last Laugh) in 1924 and Varieté (1925) (aka...