Donald L. Heck was an American comics artist best known for co-creating the Marvel Comics characters Iron Man, the Wasp, Black Widow, Hawkeye and Wonder Man and for his long run penciling the Marvel superhero-team series The Avengers during the 1960s Silver Age of comic books.

Iron Man is a superhero appearing in American comic books published by Marvel Comics. Co-created by writer and editor Stan Lee, developed by scripter Larry Lieber, and designed by artists Don Heck and Jack Kirby, the character first appeared in Tales of Suspense #39 in 1963, and received his own title with Iron Man #1 in 1968. Shortly after his creation, Iron Man was a founding member of a superhero team, the Avengers, with Thor, Ant-Man, the Wasp, and the Hulk. Iron Man stories, individually and with the Avengers, have been published consistently since the character's creation.