Personal History of Dennis O'Neil is unknown.
His best-known works include Green Lantern/Green Arrow and Batman with Neal Adams, The Shadow with Mike Kaluta and The Question with Denys Cowan, all of which were hailed for their sophisticated stories that expanded the artistic potential of the mainstream portion of the medium. As an editor, he is principally known for editing the various Batman titles. Today, he sits on the board of directors of the charity The Hero Initiative.
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