David Guymer is a scientist-turned science fiction and fantasy author from the north of England. His work includes many novels in the Warhammer, Warhammer 40,000, and Marvel universes, notably Dark Avengers: The Patriot List, the bestselling audio production Realmslayer, and Hamilcar: Champion of the Gods, which has since been adapted into an animated TV series. He has also contributed to fantastical worlds in video games, tabletop RPGs, and board games.