Mike McMahon is probably best known to most of us for providing the art for the first published Judge Dredd story.Judge Dredd was created for 2000ad in 1977 by writer John Wagner and artist Carlos Ezquerra, but problems in pre-publication led to both creators walking out, and the first published story was written by Peter Harris and Pat Mills, and drawn by the inexperienced and young artist, Mike McMahon. Mike was chosen by Pat Mills, who was editor at the time, because he could do a passable imitation of Ezquerra's style, but the more he drew the more his own style emerged. Before long he became one of the character's most regular artists.
Mike has also provided art for characters such as Sláine and ABC Warriors, and the mini-series The Last American.
Thanks to Jonathan for this.