Mark Boone Junior (born Mark Heidrich; March 17, 1955) is an American character actor, best known for his TV roles as Bobby Munson in Sons of Anarchy (2008–14) and Patrick "Pat" Brown in Last Man On Earth, and film roles in Christopher Nolan's Memento (2000) and Batman Begins (2005), Die Hard 2 (1990), and 2 Fast 2 Furious (2003).

Early life and education
Boone was born Mark Heidrich in Cincinnati, Ohio, to Ginny, a retired teacher, and Bob Heidrich, a former construction consultant. He grew up on Chicago's North Shore and attended the University of Vermont and played on the school's men's soccer team. He moved to New York after college, where he started his career performing stand-up comedy with long-time friend Steve Buscemi. His stage name surname, Boone, is also his nickname; he chose it from a New York City war memorial.