After completing his military service, O’Neil was hired to work at Marvel Comics and given a turn with characters Doctor Strange, Daredevil, and The X-Men.
In the late 60s, O’Neil signed with DC Comics and spent the next 12 years working on Wonder Woman, Justice League of America, Green Lantern and Green Arrow, Batman, and Superman.
O’Neil won praise for tackling serious subject matter in his books, tackling social and political issues. He also helped create Batman villains Ra’s al Ghul and Talia al Ghul, and revitalized the Joker character.
In a 2011 interview with SLU alum magazine Universitas, O’Neil took pride in returning Batman to his darker roots following the end of the campy television series of the 60s.
“Batman is a wonderful storytelling tool because he’s terribly human,” O’Neil said. “Oh, he could beat me up, bench-press 500 pounds and do a marathon in two hours, but the reason he exists is a childhood tragedy. It’s one that is so deep in kids, fear of loss of parents. It’s the basis of a lot of fairy tales.”
O’Neil returned to Marvel Comics in 1980 and got to work on “The Amazing Spider-Man,” as well as “Iron Man” and “Daredevil” books.
In 1986, O’Neil went back to DC Comics and returned to serve as editor on “Batman” titles, as well as writing for “The Question” and “Green Arrow.”
O’Neil is even credited with coming up with the name Optimus Prime, leader of the Autobots in “The Transformers” series.