Andy Ristaino is a character designer on Adventure Time. He began working on the series during its second season and has recently taken over from Phil Rynda as lead character designer. He helped write the episode "Little Dude," based on an idea focusing on Finn's hat's origins.
He also attended RISD, where he was classmates with Seth MacFarlane, who later became a storyboard artist of Johnny Bravo and later created Family Guy, American Dad!, and The Cleveland Show. Here both Andy and Seth appeared in RISD's Film Society Welcome video where Andy appears in 1:42.
He was described as a type of "wood elf," a "scribbler," and a "holder of paper and pens" in the dictionary from "Mystery Train."
He is apparently planning to pitch his own TV show.