an Austrian composer, most famous for his completion of Wolfgang Amadeus Mozart's Requiem. In 1792 he also became the vice-director and composer at the Kärntnertortheater. On commission for Emanuel Schikaneder, he composed an unsuccessful opera, Moses oder der Auszug aus Ägypten, which premiered May 4, 1792. He was more successful with Der Spiegel von Arkadien, which played across Europe in 1794, also in a Schikaneder production. This success led to his appointment as Kapellmeister at the National Theater in charge of German opera production. From this time until 1800, he was very successful and popular on the Viennese music scene.
