Keith Giffen has provided plotting, scripting, artwork or any combination thereof for titles such as All Star Comics, Legion of Super-Heroes, Ragman, Creeper, Lobo, Suicide Squad, The Defenders, Hero Squad! and, um...Ambush Bug. He's worked on the weekly series 52 and Countdown to Final Crisis, as well as 52 Aftermath- The Four Horsemen and Midnighter, plus a gazillion other things. He also was the illustrator of the New 52 Series O.M.A.C.