David Guymer is a British fantasy and science fiction author, best known for his work within the Warhammer universe. Guymer has contributed significantly to the Warhammer Fantasy and Warhammer 40,000 series, writing novels, novellas, and short stories featuring the rich lore and characters of these worlds. His notable works include the Gotrek and Felix series, which follows the adventures of a dwarf slayer and his human companion, and various entries in the Space Marine Battles and The Horus Heresy series. In addition to his Warhammer contributions, Guymer has also worked on other series and standalone novels, but his reputation is most closely tied to his contributions to the worlds created by Games Workshop. His writing often features intricate battle scenes, detailed world-building, and a deep understanding of the franchise's history and mythology.