Arnold Schönberg (Vienna, 1874 – Los Angeles, 1951) was an Austrian composer, music theorist, and painter of Jewish origin. In the 1920s, he led the Second Viennese School, where, together with his disciples Alban Berg and Anton Webern, he developed the twelve-tone composition technique, one of the greatest milestones in 20th-century musical thought. After Hitler's rise to power, he left Berlin, where he taught at the Prussian Academy of Arts, and went into exile in Paris and later to Los Angeles, where he continued his teaching work. He is also the author of an extensive work on music theory, including the essays Treatise on Harmony and Style and Idea.