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.

Filmography

• 2026Batman: Knightfall Part 1: Knightfall — Comic Book, Characters
• 2026Batman: Knightfall Part 2: Knightquest — Comic Book, Characters
• 2025Batman Ninja vs. Yakuza League — Characters
• Batman: Caped Crusader — Characters
• 2024Justice League: Crisis on Infinite Earths Part Three — Characters
• 2024Justice League: Crisis on Infinite Earths Part Two — Characters
• 2024Madame Web — Characters
• 2022Green Lantern: Beware My Power — Characters
• 2022The Batman — Thanks
• 2021Batman: Soul of the Dragon — Characters, In Memory Of
• What If...? — Thanks
• Deathstroke: Knights & Dragons — Characters
• 2020Justice League Dark: Apokolips War — Characters
• 2019Batman vs Teenage Mutant Ninja Turtles — Characters
• 2018Suicide Squad: Hell to Pay — Characters
• Titans — Thanks
• 2016Batman: Bad Blood — Characters
• DC's Legends of Tomorrow — Thanks
• 2011Batman Year One: A Conversation with DC Comics
• 2011Heart of Vengeance: Returning Batman to His Roots
• Young Justice — Characters
• Batman: The Animated Series — Story, Writer
• Batman: Knightfall Part 3: KnightsEnd — Comic Book, Characters

Appearances as themselves (18)

• Superpowered: The DC Story — Self
• 2020Joker: Put on a Happy Face — Self
• 2019Knight Immortal — Self
• 2013Masterpiece: Frank Miller's The Dark Knight Returns — Himself
• Superheroes: A Never-Ending Battle — Self
• 2013Superman vs. Batman: When Heroes Collide — Self
• 2013The Fire Rises: The Creation and Impact of The Dark Knight Trilogy — Self
• Comic Book Men — Self
• 2010Robin's Requiem — himself
• 2010Robin: The Story of Dick Grayson — Self
• 2010Secret Origin: The Story of DC Comics — Self
• 2008Batman Unmasked: The Psychology of The Dark Knight — Self
• 2007The Legends Behind the Comic Books — Self
• 2006Look, Up in the Sky! The Amazing Story of Superman — Self
• 2006The Science of Superman — Self
• 2005Legends of the Dark Knight: The History of Batman — Self
• 2003Comic Book Superheroes Unmasked — Self
• 2001Comic Books & Superheroes — Self