William Gaither "Billy" Crudup (; born July 8, 1968) is an American actor. He is best known for his roles as Russell Hammond in Almost Famous, Will Bloom in Big Fish, and as the voice of the MasterCard "Priceless" commercials in the U.S. since 2005. He also starred in the 2007 romantic comedy film Dedication. In 2009, he appeared as Doctor Manhattan in the film Watchmen and J. Edgar Hoover in the film Public Enemies. He also has experience in voice acting, having voiced the English version of Ashitaka from the Studio Ghibli animated film Princess Mononoke.