Its best-known products are Warhammer Age of Sigmar and Warhammer 40,000.įounded in 1975 by John Peake, Ian Livingstone, and Steve Jackson, Games Workshop was originally a manufacturer of wooden boards for games including backgammon, mancala, nine men's morris, and Go. Games Workshop Group (often abbreviated as GW) is a British manufacturer of miniature wargames, based in Nottingham, England.