Gav Thorpe
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Gav Thorpe is a dude in GW's development department. He is the one largely responsible for the grand mother bull moose of all mixed blessings that was the Codex: Chaos Space Marines 4th edition Codex. This codex was a huge subject of RAGE and winDread, compartmentalized in one work that has drawn both many supporters - and many completely justified haters.
He has since moved into writing for Black Library, working on almost everything that has anything to do with the Eldar (most notably the Path of the Eldar trilogy). Generally his writing hasn't been too bad, although it's nowhere near as good as their more prominent writers
He also wrote the 6th edition Hordes of Chaos book for Warhammer Fantasy, which was full of win and good fluffwise. So fuck the faggots who don't like him. Oh, and he was also the Loremaster for Warhammer Fantasy before he went freelance.
Gav also wrote the script for the Warhammer Fantasy game -- Warhammer: Mark of Chaos.