L. B. Cole
According to Wikipedia: "Leonard Brandt Cole was a comic book artist, editor, and publisher who worked during the Golden Age of Comic Books, producing work in various genres. Cole was particularly known for his bold covers, featuring what he referred to as "poster colors"—the use of primary colors often over black backgrounds. In addition to his covers, Cole did interior art for comics published by Holyoke Publications, Gilberton, and Ajax/Farrell. He also worked as an editor for Holyoke in the 1940s."