|Appeared in:||Monsters, Inc.|
Jeff is rather wimpish, due to the wrathful temper of Randall, and helps him with his plot to revolutionize the scaring industry, although he regrets it.
Jeff is initially a kind person and means well, even apologizing to Mike about his capture. He eventually falls victim to the machine himself. After Randall is banished to the human world, Jeff is a lot happier and takes on the job of making children laugh. He is voiced by the famous "Muppeteer" veteran, Frank Oz.
Jeff does not appear in Monsters University, which means that he probably met Randall after they started working at Monsters, Inc. Though, one of the ads in the credits was labeled "Fungus's Friends."