David Kaufman is an American actor and voice actor , best known as the voice of Danny Phantom on the series of the same name . David Kaufman ( born July 23 , 1969 ) is an American voice-over artist and character actor , best-known for his recent roles as the voice of Danny Fenton on Danny Phantom , the voice of Maggie 's brother Aldrin on The Buzz on Maggie , and the voice of Marty McFly , Michael J. Fox 's animated character on Back to the Future : The Animated Series .