Anton Friedrich Wilhelm von Webern was an Austrian composer and conductor active in the early to the mid-20th century. Along with Arnold Schoenberg and Alban Berg, he was a key member of the Second Viennese School. Webern's music was known for its atonal and twelve-tone techniques, as well as its concision and aphoristic quality. Despite a challenging career as a theater music director and conductor, Webern became increasingly prominent as a vocal coach, choirmaster, and teacher in Red Vienna. His mature chamber and orchestral works, written during the latter half of the 1920s, would go on to influence a generation of composers. Webern's innovative approaches to pitch, rhythm, and timbre were adopted by a wide range of European and American composers, including Olivier Messiaen, Pierre Boulez, and Igor Stravinsky.