Arnold Schoenberg
Arnold Schoenberg or Schönberg (13 September 1874 – 13 July 1951) was an Austrian and American modernist composer, music theorist, and teacher associated with developing variation, the emancipation of the dissonance, and twelve-tone composition. He taught composition in Vienna and at the Prussian Academy of Arts (1925–1933), resigning in anticipation of Nazi Germany's civil–service restrictions.