Born in New York City, Post grew up in the Coney Island and Sheepshead Bay neighborhoods of Brooklyn and then in The Bronx.

I used to draw on a piece of paper while lying on the floor, and my father would come home from work and he'd squat down next to me and say, "The lion's jaw is broader than that, y'know?"...

[6] To supplement what even then was considered a meager income, Post broke into comic books—first being rejected by the L. B. Cole studio on 42nd Street and then successfully selling work to artist Bernard Baily on West 43rd.

[4] He later went up to director and writer position at Famous Studios, and created and designed a character named Honey Halfwitch (voiced by Shari Lewis), who is half-wizard, half-girl.

The two main characters, Alf and Sandy, were indeed castaways, but the island is hardly deserted: One of the strip's running gags was how closely the natives' society resembled Western civilization.

Other characters, all natives, included a one-man police force, a doctor, and a chef running a cafe with inedible food.

[13] In the mid-to-late 1980s, Post drew for the Star imprint of Marvel Comics, on titles such as Heathcliff[14] and Care Bears.

[4] A long-time resident of Leonia, New Jersey, he was survived by his companion of 24 years, Pamela Rutt, and two daughters, Andee Post and Glynnis Doda.