Franz Xaver Süssmayr

Franz Xaver Süssmayr or Süßmayr (Austrian German: [frants ˈksaːvɐ ˈsyːsmaɪɐ]; 1766 – September 17, 1803), also anglicized as Suessmayr, was an Austrian composer and conductor. Popular in his day, he is now known primarily as the composer who completed Wolfgang Amadeus Mozart's unfinished Requiem.