Marc Laidlaw is an American writer. Until 2016, he was a writer for the video game company Valve, where he worked on the Half-Life and Portal series. Before joining Valve, Laidlaw was a novelist working in the fantasy and horror genres. In 1996 he won the International Horror Guild Award for his novel The 37th Mandala. In 2025, Laidlaw's 1983 short story "400 Boys" was adapted as an episode of the Netflix series Love, Death & Robots. Source: Wikipedia (en)