Lynch's first published cartoons were for the Roosevelt University humor magazine, the "Aardvark"; he also contributed to a wide range of college humor publications. Lynch soon graduated to professional humor magazines like "Sick", "Cracked", and "The Realist"; and when the underground press movement started in the mid-1960s he became a regular contributor to papers like the Chicago Seed, and (thanks to the Underground Press Syndicate) the "Berkeley Barb", the "East Village Other", "Fifth Estate", and others. Beginning in 1967, Lynch became the lead writer for the "Bazooka Joe" comics, a gig he kept until 1990.