Jason Pierce aka J. Spaceman or Spaceman (born 19 November 1965 in Rugby) is an English musician. He was formerly the joint leader - with Peter Kember - of the influential 1980s psychedelic band Spacemen 3, and is now the leader and sole permanent member of Spiritualized.
In between his work with Spiritualized, Pierce has been active with a network of free jazz players and improvisers, collaborating with a number of artists, including jazz legend Dr. John, Primal Scream, Daniel Johnston and The White Stripes, among others.
In 2006 Pierce released his first solo album, Guitar Loops. .