Mosco first got interested in reggae as a teenager in Manchester. He started attending sound system events in Moss Side and Hulme, before travelling further afield, experiencing the likes of Jah Shaka. In 1981 he moved to London and was invited by Tim Westwood to do a reggae show on a pirate station called LWR. He also worked as a selector on the Humble Lion sound system, which in 1987 was renamed Jah Warrior. In 1990 he put out an album called Warrior Dub under the name Zulu Warriors. In 1995 he started the Jah Warrior record label, the first release being "The 22nd Book" by Naph-Tali, followed by the album One of These Days. Since 1999, he has concentrated on production.
He has since produced albums by artists such as Hughie Izachaar, Tena Stelin, Prince Alla, Peter Broggs, Trinity, Dillinger, Rod Taylor, U Brown, Alton Ellis, Anthony Johnson, Dennis Alcapone, Horace Andy, and Jah Mason, as well as dub releases as Jah Warrior, working with Dougie Wardrop (aka A. Millgate), and Jah Warrior has become one of the leading independent roots and reggae labels in the UK. His Dub From The Heart series of albums are considered some of the most interesting examples of that genre from the mid to late 90's.
- Steve Mosco. "Jah Warrior: Brief History". jahwarrior.com. Retrieved 10 February 2008.
- Jakob Levi (May 2005). "Interview with Steve "Jah Warrior" Mosco at the Reggaemusicstore.com premises". Guidelight Movement. Archived from the original on 23 September 2007. Retrieved 10 February 2008.
- "Top 10s: Jah Warrior". reggaenews.co.uk. Retrieved 10 February 2008.
- Greg Whitfield (January 2003). "Interview: Jah Warrior". reggaenews.co.uk. Retrieved 10 February 2008.
- "Jah Warrior feat Prince Alla - Roots of Dub Funk 3 - 'Our Father Dub'". tantyrecord.com. Retrieved 10 February 2008.
- "Sonic Garden :: Jah Warrior". sonicgarden.com. Archived from the original on 1 June 2004. Retrieved 10 February 2008.
- "The International Farmer: Peter Broggs". pterbroggs.com. Archived from the original on 21 January 2008. Retrieved 10 February 2008.