Patrick Kennedy, born August 26, 1977 in London, England, UK, is an actor. He plays Dr. Douglas Mason in Boardwalk Empire. He is a recurring guest star in the third season and debuts in the episode "Resolution". He has been active since 2002 and also appeared in the series Parade's End, Black Mirror, and Bleak House. He has had roles in the films A Good Year (2006), Atonement (2007), War Horse (2011), and Pirates of the Caribbean: On Stranger Tides (2011).