 She worked briefly in Hollywood during the early talkie era, appearing in the foreign-language versions of such films as "The Trial of Mary Dugan" (1929) and "His Glorious Night" (1929).She was considered to be one of Austria's most popular film stars during that time and she also appeared as a stage actress at the famous Burgtheater.During her French exile, Gregor played her most famous screen role as Christine de la Chesnaye in Jean Renoir's 1939 film "La Règle du Jeu".