Mark Simpson, best known as Jock, started out painting Magic Cards and roleplaying game illustrations. In late 1999, he began working full-time in comics for 2000AD and the Judge Dredd Megazine, doing stories with 'Judge Dredd', 'Lenny Zero' and 'Tor Cyan'.
Together with his 2000 AD companion, writer Adrian Diggle, he began working on the Eisner award nominated series 'The Losers' for DC/Vertigo in 2003. He has also done covers for 'Batman' and 'Detective Comics'. He has also cooperated on the 'Batman: Begins' movie from Warner Bros, and worked for MTV, British Airways, Playstation, Nintendo, BBC, NBA and GT Interactive.