Mark Eugene Gruenwald (/ˈɡruːnwɔːld/; June 18, 1953 – August 12, 1996) was an American comic book writer, editor, and occasional penciler known for his long association with Marvel Comics.
Gruenwald got his start in comics fandom, publishing his own fanzine, Omniverse, which explored the concept of continuity. Before being hired by Marvel, he wrote text articles for DC Comics’ official fanzine, The Amazing World of DC Comics. Articles by Gruenwald include "The Martian Chronicles" (a history of the Martian Manhunter) in issue #13 and several articles on the history of the Justice League in issue #14.
In 1978 he was hired by Marvel Comics, where he remained for the rest of his career. Hired initially as an assistant editor in January 1978, Gruenwald was promoted to full editorship by Marvel editor-in-chief Jim Shooter in 1982, putting Gruenwald in charge of The Avengers, Captain America, Iron Man, Thor, Spider Woman, and What If. During this period, he shared an office with writer/editor Denny O'Neil, whom Gruenwald considered a mentor.

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