Williamson's art was published in the National Lampoon, High Times, the Realist, the Industrial Worker, the Chicago Seed, Encyclopædia Britannica and others.
Williamson's real first name is Mervyn; however when he was a child, he was a bit of a troublemaker, so his grandmother gave him the nickname "Skip" after Percy Crosby's comic strip character "Skippy".
In 1968, Williamson, Lynch, and Robert Crumb rechristened the Chicago Mirror as Bijou Funnies, which became one of the earliest and longest running underground comix titles.
Williamson's character Snappy Sammy Smoot became popular enough to appear (played by Carl Reiner) on the 1960s television program Rowan & Martin's Laugh-In.
artistically "legitimate," but to those struggling to make sense of the socio-political chaos, Williamson was frequently the funnier.
In 1973 he was art director of Gallery magazine, where he created the “Girl Next Door” concept by publishing snapshots of sweethearts and wives sent in by readers.
[1] There he created the popular "Playboy Funnies" section and introduced millions of readers to his characters Neon Vincent and the "postmodern" couple Nell ‘n’ Void.
Williamson designed album covers for blues artists like Albert Collins (Cold Snap, 1986), Koko Taylor (An Audience With the Queen, 1987), Little Charlie and the Nightcats (All The Way Crazy, 1987) and Mudcat (You Better Mind, 2013).
Dr. Jerry Cullum, senior editor of Art Papers, wrote in the Atlanta Journal-Constitution: Williamson knows how to put together a picture, balancing color and skewed perspective as effectively as any realist painter would.
He fits perfectly into a type of art championed by Juxtapoz magazine, in which a cartoon style is put to intelligent but outrageous uses.
And his cynical view of humanity, worthy of such past satirists as Honoré Daumier, is dead-on regarding the place where most people are.
Williamson's comics are included in the permanent collection of the Ryerson & Burnham Libraries at the Art Institute of Chicago.