Joachim Mendelson
Polish composer Joachim (or Leon) Mendelson (or Mendelsohn) was born in Warsaw, possibly on 21 November 1892. (Other sources state that he was born in 1890 or 1897.) He studied in Warsaw and in Berlin, then lived in Paris from 1929, where he was part of the Association des Jeunes Musiciens Polonais.
He returned to Warsaw in 1935 to work as a teacher, and was also musical director at a small revue theatre there (1941-42) but was imprisoned in the Warsaw Ghetto and murdered by the Gestapo in 1943.