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Dennis O'Neil
Dennis Joseph O'Neil (May 3, 1939 – June 11, 2020) was an American comic book writer and editor, principally for Marvel Comics and DC Comics from the 1960s through the 1990s, and Group Editor for the Batman family of titles until his retirement. His best-known works include Green Lantern/Green Arrow and Batman with Neal Adams. It was during this run that O'Neil co-created the Batman villains Ra's al Ghul and Talia al Ghul. His other notable work includes runs on The Shadow with Michael Kaluta and The Question with Denys Cowan. As an editor, he is principally known for editing the various Batman titles. He also sat on the board of directors of the charity The Hero Initiative and served on its Disbursement Committee. Description above from the Wikipedia article Dennis O'Neil, licensed under CC-BY-SA, full list of contributors on Wikipedia.
Known For

Look, Up in the Sky! The Amazing Story of Superman
as Self

The Fire Rises: The Creation and Impact of The Dark Knight Trilogy
as Self

Joker: Put on a Happy Face
as Self

Batman Unmasked: The Psychology of The Dark Knight
as Self

Secret Origin: The Story of DC Comics
as Self

Knight Immortal
as Self

Comic Book Superheroes Unmasked
as Self
Superman vs. Batman: When Heroes Collide
as Self

Batman Year One: A Conversation with DC Comics

Legends of the Dark Knight: The History of Batman
as Himself