Roy William Thomas Jr. is an American comic book writer and editor. He was Stan Lee's first successor as editor-in-chief of Marvel Comics and possibly best known for introducing the pulp magazine hero Conan the Barbarian to American comics. Thomas is also known for his championing of Golden Age comic-book heroes—particularly the 1940s superhero team the Justice Society of America—and for lengthy writing stints on Marvel's X-Men and The Avengers, and DC Comics' All-Star Squadron and Infinity Inc., among many other titles.