Bruce Cordell
Bruce R. Cordell is a game designer chiefly responsible, alongside Monte Cook and Carl Lynwood Sargent, for the resuscitation of Dungeons & Dragons in its second edition and, thereby, for the foundations of the third. The Far Realm is his baby.
Cordell was a biologist by training, like Sargent was a psychologist, before entering this hobby as a writer. Where Sargent featured horror and madness (and the Underdark), Cordell's best work tended to the Weird Science that leads to such ends. His second-edition credits include Gates of Firestorm Peak, the extension of Tomb of Horrors, and the Illithiad. And holy shit he co-wrote Die, Vecna, Die!.