Mark Boone Junior is an American character actor, known for his rugged face and intense presence. A specialist in supporting roles, he often portrays complex and marginalized characters, from criminals and sociopaths to ambiguous figures or unorthodox police officers.

He has frequently collaborated with prominent directors: with Christopher Nolan in *Memento* (as Burt) and *Batman Begins* (as Detective Flass); with David Fincher in *Seven* and *The Game*; and with Abel Ferrara in numerous films such as *King of New York* and *Bad Lieutenant*.

Other significant film credits include *Trees Lounge*, *30 Days of Night*, and *Armageddon*. While his primary focus has been film, he is also widely recognized for his role as Bobby Munson in the popular TV series *Sons of Anarchy*, solidifying his reputation as a familiar and respected face in the acting landscape.