Robert Peterson (born January 18, 1961) is an American animator, director, screenwriter, storyboard supervisor, and voice actor who works at Pixar. He was hired at Pixar by Roger Gould in 1994 as an animator for commercials, before subsequently becoming an animator on Toy Story (1995). He was the co-director and co-writer for Up (2009), in which he also voiced the characters Dug and Alpha. Wikipedia