Arthur "Art" Marcum is an American screenwriter best known for his work on major Hollywood action, science fiction, and superhero films. He frequently collaborates with fellow screenwriter Matt Holloway, forming one of the industry's most successful writing partnerships. Marcum first gained worldwide recognition as one of the co-writers of Iron Man (2008), the film that launched the Marvel Cinematic Universe and introduced Robert Downey Jr.'s iconic portrayal of Tony Stark. The enormous success of Iron Man established him as a sought-after screenwriter for blockbuster productions. He later co-wrote films including Punisher: War Zone, Transformers: The Last Knight, Men in Black: International, Uncharted, and Kraven the Hunter. Throughout his career, Marcum has become known for crafting fast-paced action stories, witty dialogue, and character-driven adventures designed for large-scale franchises. His work has played a significant role in shaping modern blockbuster cinema, particularly within the superhero genre.