Jack Warren
Jack Warren is credited as penciller on 77 issues, inker on 75 issues, writer on 51 issues, letterer on 13 issues and others in grailworth's catalog, 24 issues of them across 12 series we value. Characters first seen in issues they wrote or drew include George Washington and The Claw.
Characters they introduced
Every issue
Air Fighters Comics (1941) 1 issue
Blue Circle Comics (1944) 1 issue
Cow Puncher Comics (1947) 1 issue
Gem Comics (1945) 1 issue
Headline Comics (1943) 1 issue
Key Comics (1944) 1 issue
Lucky Comics (1944) 1 issue
Popular Comics (1936) 3 issues
Silver Streak Comics (1939) 2 issues
Target Comics (1940) 4 issues
Twinkle Comics (1945) 1 issue
Credits from the Grand Comics Database, CC BY-SA 4.0.