Co-creations of O'Neill with Pat Mills include The ABC Warriors, Nemesis the Warlock, and Metalzoic for 2000AD.
During the mid-1980s O'Neill's work began appearing in North America. He encountered numerous difficulties with censors (the Comics Code Authority) who were aghast at the quirky yet apparently subversive nature of his artwork. He went freelance in the mid-1980s and produced material such as the black comedy superhero title Marshall Law with Pat Mills for Epic, and work for Dark Horse, and Marvel Comics amongst others..
Kevin O'Neill (b.1957-) is a basketball coach in the NCAA and the NBA. After tenures at Northwestern University, University of Tennessee and Marquette, he became an assistant coach under Jeff Van Gundy with the New York Knicks. Later he joined the Detroit Pistons since 2001 under former head coach Rick Carlisle, who was replaced by Larry Brown despite winning 50 games and consecutive playoff appearances in those seasons.
O'Neill was hired in June 2003 as the head coach of the Toronto Raptors.