After his military service, Jim Sasseville entered the Mineapolis School of Art, where he degreed in 1948. He then joined the Art Instruction School, where he met Charles M. Schulz. Sasseville became good friends with Schulz, who pushed into a career in comics. The success of the Schulz's 'Peanuts' newspaper comic led to a series of comic books in the 1950s and 1960s. Where Schulz never handed out the artwork of the daily strip, the comics for the books were assigned to Sasseville. The comic originally appeared in Tip Top and Dell's Nancy, but got its own feature later on in Dell's Four Color Comics line. In the early 1960s, Sasseville was succeeded by Dale Hale. In the late 1950s, Sasseville also assisted Schulz on the weekly newspaper strips 'It's Only a Game'.