Mark Cantrell
Mark Cantrell is credited as writer on 10 issues, inker on 8 issues, penciller on 7 issues, letterer on 1 issue and others in grailworth's catalog, 4 issues of them across 3 series we value. Characters first seen in issues they wrote or drew include Harry Diamond, Captain Tom Kelly, Jennifer Burke and Jason Wayne.
Characters they introduced
Every issue
Bolt Special (1984) 1 issue
Captain Paragon (1983) 2 issues
Mad (1952) 1 issue
Credits from the Grand Comics Database, CC BY-SA 4.0.