David Kaufman (born July 23, 1961) is an American actor. He is best known for his role as Duane Preston in Down to Earth and for his voice roles such as Danny Fenton/Danny Phantom in Danny Phantom, Jimmy Olsen in various DC projects beginning with Superman: The Animated Series, Dexter Douglas in Freakazoid!, Aldrin in The Buzz on Maggie, Marty McFly in Back to the Future, and Stuart Little in the animated series of the same name. He often serves as a voice double for Michael J. Fox. (Via Wikipedia)