He was the lead designer on almost every Games Workshop specialist game that you remember from the 90's. He also wrote a lot of balanced codices. Although the codices were a master piece of character, fun, and balance, the wording of the rules could be shoddy, ambiguous, contradictory, and even missing at times
just like modern Games Workshop rules. Also wrote for White Dwarf a lot, usually under the subtitle "Chambers of the Horned Rat".
Lately, he's been working for Hawk Wargames on Dropfleet Commander, and for Warlord Games on Blood Red Skies. It's also been recently revealed that he will be writing the story for the upcoming Necromunda Vidya gaem, in a pseudo-return to his roots.