From Chaosium page:
Mike Mason is the co-writer of the Call of Cthulhu 7th edition Keeper's Rulebook. Around the turn of the millennium, Mike edited and published The Whisperer, a zine devoted to Call of Cthulhu. In the intervening period Mike set up and ran the Kult of Keepers, a group of Call of Cthulhu scenario writers who organized the UK's Cthulhu Nationals Tournament. Mike, no stranger to the arcane workings of games companies, previously worked for Games Workshop as Black Industries Line Manager for the Ennie Award winning Warhammer 40,000 RPG Dark Heresy before the line moved to FFG.
Nowadays Mike lives in the small village of Gotham, near Nottingham, England, where legends speak of mad men, kings, and cuckoos.