Atlas and EC
Wessler began writing for Atlas Comics in November 1950 with the six-page story "The Mad Monk" about the historical figure Grigori Rasputin, published in Amazing Detective Cases #6 (May 1951). He soon became Atlas' primary crime fiction writer, often scripting entire issues of All-True Crime, Amazing Detective Cases, Crime Can't Win, Crime Exposed, Crime Must Lose, Justice, and Kent Blake of the Secret Service.[7] Going on staff in 1952, he became a member of the Atlas bullpen with fellow writers Hank Chapman, Ernie Hart, Paul S. Newman, Don Rico and, on teen humor comics, future Mad cartoonist Al Jaffee. Wessler wrote horror/fantasy stories for such titles as Adventures into Terror, Adventures into Weird Worlds, Astonishing, Mystic, and Suspense, later adding to his body of work such war comics as Battle, Battle Action, Battlefield, Combat, and Men's Adventures.[6]
In 1953, EC Comics—which in the 1950s produced a number of horror and dramatic titles later considered to be classics of the field—recruited Wessler, Jack Oleck, Daniel Keyes, and other writers. Wessler contributed a large number of stories to EC's famed horror titles Tales from the Crypt, and The Vault of Horror—writing the entirety of Tales from the Crypt #45 (Jan. 1955), for instance, with the artists including Graham Ingels, Jack Davis, Jack Kamen, and Bernard Krigstein. He wrote as well for EC's Aces High, Crime SuspenStories, Impact, Piracy, Shock SuspenStories and Weird Science-Fantasy.[6]
Following the demise of EC in the wake of the newly formed Comics Code Authority's crackdown on graphically violent comic books, Wessler returned to Atlas in late 1955 as a freelance writer. There he scripted science fiction/fantasy stories for Mystic and, prolifically, World of Fantasy. His last Atlas work appeared in issue #15 of the latter, cover dated December 1958.[6]