Although he worked on the popular children's series Fighting Fantasy as an editor, he only ever published one gamebook as author, which was called Battleblade Warrior (1988).
However, he also wrote two related novels, and five books under the Advanced Fighting Fantasy banner, including Titan (1986), an encyclopedia of the fictional world in which most of the gamebooks are set.
After ten years as a freelance editor, he returned to Games Workshop in 1997 to help establish the Black Library fiction imprint.
Gascoigne, with Rick Priestley and Andy Jones of Warhammer, developed the idea for the Black Library which produced the magazine Inferno!
It was announced on 11th Sept 2008 that he had joined HarperCollins to create a new science fiction & fantasy imprint to be called Angry Robot.