Hal Foster
Hal Foster is credited as penciller on 282 issues, inker on 279 issues, writer on 240 issues, letterer on 123 issues and others in grailworth's catalog, 92 issues of them across 9 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) 73 issues
Comics on Parade (1938) 1 issue
Feature Book (1936) 1 issue
King Comics (1936) 2 issues
Large Feature Comic (1939) 1 issue
Single Series (1938) 1 issue
The Tarzan Family (1975) 3 issues
Tip Top Comics (1936) 4 issues
Credits from the Grand Comics Database, CC BY-SA 4.0.