Robert Lee Zemeckis is an American film director, producer, and screenwriter who is perhaps best known for directing some of the greatest blockbuster movies of all time, most notably the Back to the Future film trilogy, Beowulf, and The Polar Express.  He pioneered ImageMovers Digital Studios for the Walt Disney Company and directed the films Who Framed Roger Rabbit and A Christmas Carol. He was also the producer of Mars Needs Moms.