Max Henry Wolf Burkholder (born November 1, 1997) is an American actor most notable for his role of Max Braverman, who has Asperger syndrome, in the NBC comedic television drama Parenthood. Prior to that, he became known as a voice actor for his roles as Chomper in The Land Before Time, Roo on My Friends Tigger & Pooh, and World in the Foster's Home for Imaginary Friends TV movie "". In 2013, he appeared in The Purge.