Jimmy Hatlo
Jimmy Hatlo is credited as penciller on 183 issues, writer on 167 issues, inker on 164 issues and cover artist on 15 issues in grailworth's catalog, 98 issues of them across 4 series we value. Characters first seen in issues they wrote or drew include Prince Valiant, King Aguar of Thule, Horrit and Thorg.
Characters they introduced
Every issue
Ace Comics (1937) 65 issues
Four Color (1942) 1 issue
Credits from the Grand Comics Database, CC BY-SA 4.0.