Johann Georg Albrechtsberger(1736-1809), German organist, theorist and profilic composer. He studied organ in Vienna, he was employed as organist at Raab in 1775, at Maria Taferl, and at Melk. In 1971 be became assistant Kapellmeister at St. Stephen's in Vienna; in 1793 he became the Kapellmeister there. He is best known as Beethoven's teacher. His compositions include: 300 sacred music, 450 instrument pieces - symphonies, chamber music etc.