[2] In 1922, together with the lecturer Fritz Wiesenthal[3] (died 31 December 1936 in a sanatorium located in Mauer, Vienna at age 53/56),[4] Hermann und Ferdinand Leopoldi opened the cabaret "Leopoldi-Wiesenthal", short "L.W.
In addition to Leopoldi-Wiesenthal, more or less regularly appeared Charlotte Waldow,[6][better source needed] Franzi Ressel,[7] Armin Berg [de], Hans Moser, Szöke Szakall, Max Hansen, Fritz Grünbaum, Karl Valentin or Raoul Aslan and Otto Tressler.
Hermann had more and more solo appearances, Ferdinand took part in the 1926 movie Die Pratermizzi and was mainly active as bar pianist before he had numerous appearances with Robert Rakowianu[8] (1886-1938) and Grete von Király on the radio in the 1930s.
After the Anschluss of Austria, his brother Hermann was deported to the Dachau Concentration Camp in 1938 and was able to emigrate to the US in 1939.
Leopoldi, who was married to an Aryan, stayed in Vienna and lived secretly during the Austria under National Socialism period in an apartment in the Viennese Bellariastraße [de].