John McCrea began his career in 1988, working on the 2000 AD comic magazine which was then published by the now-defunct Fleetway Publications.
His first work for DC Comics was issue #40 of The Demon (Vol 3) which was published in October 1993. He had also worked on its spin-off series, Hitman, with issue #34 earning him the Eisner Award for Best Single Issue in 1999.
He is known to work with Garth Ennis on several titles. They are the creators of the team Section Eight.