During the 1980s and 1990s he was a member of The Christians. Priestman has also been used as a session musician by both Bette Bright and Mike Badger. In 1996, Priestman recorded ending theme song for the Cartoon Network series "Dexter's Laboratory". Priestman played keyboards on Badger's albums, "Lo Fi Acoustic Excursions by Mike Badger & Friends" (2004), "The Onset" (2005), and "Lo Fi Electric Excursions by Mike Badger & Friends" (2006).