Austrian composer. He was also active as an organist, highly acclaimed for his performances, especially of Bach's works. Besides partitas and sonatas for organ, he composed works primarily centered around choral music. He studied piano, harpsichord, organ, and music theory at the Vienna State Academy of Music. As a composer, he favored polyphonic styles, similar to the works of Hindemith. He also frequently employed chromaticism and incorporated twelve-tone technique.