John Callahan was a cartoonist perhaps best known for dealing with macabre subject matter and physical disabilities. Callahan was paralyzed at age 21 after a car accident, and following this he became a successful cartoonist. Robin Williams purchased the rights to Callahan's autobiography Don’t Worry, He Won’t Get Far on Foot
around the time this cartoon—which features Williams as a character—was completed. The note on the verso reads: "Robin, thanks so much for making me so comfortable! I feel very good about about signing the option (which I did last week). See you! John".
Callahan died in 2010, and at that point, a film had not yet come to fruition. In July of 2018, Don’t Worry, He Won’t Get Far on Foot, premiered in Los Angeles, with Joaquin Phoenix filling in for the late Williams as its star, and Gus Van Sant—who directed William in Good Will Hunting (Miramax, 1997)—served as director, screenwriter, and editor.