The vast majority of his work went unsigned, both in the manner of that time and during his staff-writing position at one company from the 1950s to 1980s, making a comprehensive bibliography difficult or impossible to compile.

In addition, Gill's Timely stories were actually written, often pseudonymously for Funnies, Inc., an outsource "packager" that created comics on demand for publishers testing the waters of the then-new medium.

[4] Gill is reportedly among the writers who scripted Captain America for Timely following the departure of character creators Joe Simon and Jack Kirby in late 1941.

[3] Around this time, Gill met future hardboiled detective novelist Mickey Spillane, a lifelong friend, who also began writing for Funnies, Inc.

[citation needed] When Giordano was hired at industry leader DC Comics in 1969, he commissioned scripts from Gill for such titles as The Secret Six and the toy-license property Hot Wheels.

[citation needed] When Charlton Comics ceased publication in 1986, Gill retired from comic-book scripting save for an occasional freelance story for DC.

He appeared as a guest, with fellow Charlton alumni Willie Franz and Sam Glanzman, at a New York City comics convention panel, broadcast November 21, 2000, on the WBAI radio show 'Nuff Said!