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Man.... it's hard to believe it was already 4 years ago that O'Neil died.
(May 3, 1939 – June 11, 2020) Age 81

https://en.wikipedia.org/wiki/Dennis_O%27Neil

O'Neil's Wikipedia listing gives a pretty near complete list of his published comics work, and other work outside of comics. Including science fiction and detective anthology short stories.
And even a few TV scripts I was unaware of till now.