Charles Monroe Schulz (November 26, 1922 – February 12, 2000), nicknamed Sparky, was an American cartoonist, best known for the comic strip Peanuts (which featured the characters Snoopy and Charlie Brown, among others). He is widely regarded as one of the most influential cartoonists of all time, cited as a major influence by many later cartoonists. Calvin and Hobbes-creator Bill Watterson wrote in 2007: "Peanuts pretty much defines the modern comic strip, so even now it's hard to see it with fresh eyes. The clean, minimalist drawings, the sarcastic humor, the unflinching emotional honesty, the inner thoughts of a household pet, the serious treatment of children, the wild fantasies, the merchandising on an enormous scale -- in countless ways, Schulz blazed the wide trail that most every cartoonist since has tried to follow."

Schulz's first regular cartoons, a weekly series of one-panel jokes entitled Li'l Folks, were published from 1947 to 1950 by the St. Paul Pioneer Press; he first used the name Charlie Brown for a character there, although he applied the name in four gags to three different boys as well as one buried in sand. The series also had a dog that looked much like Snoopy. In 1948, Schulz sold a cartoon to The Saturday Evening Post; the first out of 17 one-panel cartoons by Schulz that would be published there. In 1948, he tried to have Li'l Folks syndicated through the Newspaper Enterprise Association. Schulz would have been an independent contractor for the syndicate, unheard of in the 1940s, but the deal fell through. Li'l Folks was dropped from the Pioneer Press in January 1950. Peanuts made its first appearance on October 2, 1950, in seven newspapers. The weekly Sunday-page debuted on January 6, 1952. After a somewhat slow beginning, Peanuts eventually became one of the most popular comic strips of all time, as well as one of the most influential. Schulz also had a short-lived sports-oriented comic strip called It's Only a Game (1957–1959), but he abandoned it due to the demands of the successful Peanuts. From 1956 to 1965 he contributed a single-panel strip ("Young Pillars") featuring teenagers to Youth, a publication associated with the Church of God.

At its height, Peanuts was published daily in 2,600 papers in 75 countries, in 21 languages. Over the nearly 50 years that Peanuts was published, Schulz drew nearly 18,000 strips. The strips themselves, plus merchandise and product endorsements, produced revenues of more than $1 billion per year, with Schulz earning an estimated $30 million to $40 million annually. During the life of the strip, Schulz took only one vacation, a five-week break in late 1997 to celebrate his 75th birthday; reruns of the strip ran during his vacation, the only time reruns occurred while Schulz was alive.