Mart Bailey
Mart Bailey is credited as penciller on 123 issues, inker on 120 issues, writer on 57 issues and cover artist on 12 issues in grailworth's catalog, 30 issues of them across 8 series we value. Characters first seen in issues they wrote or drew include Dr. Karl Hellfern, Doctor Death, Julie Madison and The Monk.
Characters they introduced
Every issue
Adventure Comics (1938) 2 issues
Big Shot (1943) 2 issues
Justice Traps the Guilty (1947) 1 issue
Sparky Watts (1942) 1 issue
The United States Marines (1943) 2 issues
The United States Marines (1952) 1 issue
Credits from the Grand Comics Database, CC BY-SA 4.0.