Don Segall
Don Segall is credited as writer on 49 issues in grailworth's catalog, 15 issues of them across 9 series we value. Characters first seen in issues they wrote or drew include The Creeper and Merman.
Characters they introduced
Every issue
Alvin (1962) 3 issues
Detective Comics (1937) 1 issue
The Flintstones (1995) 1 issue
Four Color (1942) 4 issues
Frankenstein (1963) 1 issue
The Inferior Five (1967) 2 issues
Kona (1962) 1 issue
Showcase (1956) 1 issue
Credits from the Grand Comics Database, CC BY-SA 4.0.