Mark Walton

Mark Walton is a story artist and writer who works for Disney. He has provided voices for some of the characters in recent movies, including Barry & Bob the Longhorns in Home on the Range, Goosey Loosey in Chicken Little, and Rhino in Bolt. He is credited as a writer on the movie Tarzan and on the animated short The Little Matchgirl. He is credited as a storyboard artist on Home on the Range, and as a story artist for Chicken Little, and Meet the Robinsons.

Bolt
Walton was originally asked to voice Rhino as a stand-in until an actor could be found and cast in the role. However, the directors liked his performance and decided not to hire anybody else.