Joe Quesada first became known to me with his work in Batman: Sword of Azrael, which this picture is from. He also designed the Azrael costume and the Batman costume for the temporary Azrael/Batman. Since then his work has declined, in my opinion, into a more cartoony style. He draws angular, witty figures with rich shadows and cool poses, with extremely detailed musculature. He also draws flame effects very well. His Daredevil work was great, with really cool layouts. I'm not sure about that whole "Head of Marvel" thing though.

Download the cool cover to Sword of Azrael #1 as a wallpaper below (1280x1024):