He has worked for both Marvel (Doctor Strange, Moon Knight, and others) and DC (Superman vs Aliens and others), as well as the independent comic-book sector (Aliens Salvation with writer Dave Gibbons and penciller Mike Mignola for Dark Horse Comics, among others). He also contributed to the adult Penthouse Comix.
He has been called "one of the few artists who can be called 'artists's artist'", a master of the various disciplines of comic production, from "design to draftsmanship to dramatics".