Robert "Bob" Peterson (born January 1961) is an American animator, screenwriter, director and voice actor, who has worked for Pixar since 1994. His first job was working as a layout artist and animator on Toy Story. He was nominated for an Oscar for his screenplay for Finding Nemo. Petersonis a co-director and the writer of Up, which gained him his second Oscar nomination. He also performed the voices of Roz in Monsters, Inc., Mr. Ray in Finding Nemo, Dug the dog and Alpha the dog in Up and in Dug's Special Mission, and the Janitor in Toy Story 3.