 He worked often with directorial couple Jacob and Luise Fleck "(The Orlov" in 1927, "Doctor Schäfer" in 1928, "The Tsarevich" in 1929) and Richard Oswald ("Victoria and Her Hussar" in 1931, "The Flower of Hawaii" in 1933, co-starring Marta Eggerth).Other movies from this period include 1928 "Alraune" by Henrik Galeen, co-starring Brigitte Helm and Paul Wegener, 1929 "Latin Quarter" by Augusto Genina, 1931 "The Opera Ball" by Max Neufeld, co-starring Liane Haid and "Die Fledermaus" by Karel Lamač, 1932 "Grandstand for General Staff" by Eugen Thiele, 1934 "Paganini", in title role, by E. W. Emo, co-starring Theo Lingen, and "The Last Waltz" by Georg Jacoby, 1935 "The Cossack and the Nightingale" by Phil Jutzi, 1937 "Unter Ausschluß der Öffentlichkeit" by Paul Wegener and 1939 "Zentrale Rio" by Erich Engels, co-starring Ita Rina.After the World War II began, Petrovich continued to act in mostly lightweight, fun movies.