Passage: Matt Groening first conceived of Bart and the rest of the Simpson family in 1986, while waiting in the lobby of producer James L. Brooks' office. Groening had been called in to pitch a series of animated shorts for The Tracey Ullman Show, and had intended to present an adaptation of his Life in Hell comic strip. When he realized that animating Life in Hell would require him to rescind publication rights, Groening decided to go in another direction. He hurriedly sketched out his version of a dysfunctional family, naming the characters after members of his own family. For the rebellious son, he substituted "Bart", an anagram of the word brat, for his own name, as he decided it would have been too obvious for him to have named the character 'Matt'. Bart's middle initial J is a "tribute" to animated characters such as Bullwinkle J. Moose and Rocket J. Squirrel from The Rocky and Bullwinkle Show, who received their middle initial from Jay Ward. According to the book Bart Simpson's Guide to Life, Bart's full middle name is "JoJo".Bart had originally been envisioned as "a much milder, troubled youth given to existential angst who talks to himself", but the character was changed based on Cartwright's voice acting. Groening has credited several different figures with providing inspiration for Bart: Matt Groening's older brother Mark provided much of the motivation for Bart's attitude. Bart was conceived as an extreme version of the typical misbehaving child character, merging all of the extreme traits of characters such as Tom Sawyer and Huckleberry Finn into one person. Groening describes Bart as "what would happen if Eddie Haskell [from Leave It to Beaver] got his own show". Groening has also said that he found the premise of Dennis the Menace disappointing and was inspired to create a character who was actually a menace.Bart made his debut with the rest of the Simpson family on April 19, 1987 in The Tracey Ullman Show short "Good Night". In 1989, the shorts were adapted into The Simpsons, a half-hour series airing...

Question: Who is the Simpson family creator?
Matt Groening