Robert Leffler (9 January 1866 – 15 March 1940) was a German actor, film director and opera singer (bass). Leffler was trained as a singer in Berlin. He began his career in 1889 as a singer and actor at the Basel City Theater, where he stayed until 1891. Leffler initially appeared primarily as a bass singer at various opera houses such as Nuremberg, Meiningen, Lübeck, Riga, Moscow and Düsseldorf, where he was senior director and opera director at the city theater for 17 years. From 1919 to 193 ...