After severing ties, Western established its own comic-book imprint, Gold Key Comics, which launched its own Lone Ranger title.

[8] Gill's other comic-book work includes the spin-off The Lone Ranger's Famous Horse Hi-Yo Silver ; the TV-Western tie-in Bonanza, and the equine-series tie-in Fury ; the six-issue Native American-hero Western Red Warrior (Jan.-Dec. 1951) for Atlas Comics, the 1950s precursor of Marvel Comics; and, with writer Jerry Siegel, the sole two issues (April 1967 & April 1968) of Gold Key's self-consciously camp revival of creator Frank Thomas' 1940 character The Owl.

In that same interview, he explained his philosophy of drawing the Lone Ranger's famed white steed: "You had to make Silver a glamour horse.

For roughly 50 years, Gill taught cartooning and children's-book illustration in New York-area colleges and institutions, including the School of Visual Arts, where he served as a department chair in 1948, alumni director in 1969, and consultant well into the 21st century.

With Tim Lasiuta, he wrote the autobiography Misadventures of A Roving Cartoonist: The Lone Ranger's Secret Sidekick (Five Star Publications, 2008)[11] Gill lost his eyesight later in life but continued to teach art at community colleges.