Dennis Lehane (born Aug 4th, 1966) is an American author. He has written several novels, including the New York Times bestseller Mystic River, which was later made into an Academy Award winning film, also called Mystic River, directed by Clint Eastwood and starring Sean Penn, Tim Robbins, and Kevin Bacon (Lehane can be briefly seen waving from a car in the parade scene at the end of the film).