 Chambers is best known for his work for Games Workshop, where he worked from March 1990 to March 2004.He worked extensively on various "Warhammer 40,000" rulebooks and sourcebooks, and also authored multiple fiction novels set in the same universe.Chambers was the lead designer on a number of "Warhammer" "40,000" spin-off games, such as Necromunda (1995) and Battlefleet Gothic (1999), produced by Specialist Games.