Karel Hašler
Karel Hašler (31 October 1879 in Prague – 22 December 1941 in Mauthausen) was a Czech songwriter, actor, lyricist, film and theatre director, composer, writer, dramatist, screenwriter and cabaretier. He was murdered in the Mauthausen concentration camp. Biography Hašler studied to be a glove-maker, but he became intererested in theatre at a young age and occasionally performed with amateur theatre ensembles. In 1897, following his debut at the Aréna Theatre he left home and successively joined various travelling theatre companies. In 1902 he became a member of the Slovenian theatre in Ljubljana, but soon moved back to Prague, where he joined the National Theatre ensemble. In the National Theatre, he asserted himself in conversational plays. In addition to that, he also attempted to apply his singing abilities. Around 1908, he started composing his own music, and at the same time he began to incline to cabaret activities. Gradually he became a director and head of various Prague cabarets, such as Lucerna (1910–1915, 1918–1923), Rokoko (1915–1918) and Karlín Variety Theatre (1924–1929). In 1908, he married a sister of pianist and composer Rudolf Friml. During World War I he also began to appear in silent films, as an actor, director and author.