Titus B. Welliver is an American actor. He is best known for his portrayals of the Man in Black in Lost, Silas Adams in Deadwood, Jimmy O'Phelan in Sons of Anarchy, and the title role in the television series Bosch and Bosch: Legacy. He is also known for his collaborations with Ben Affleck, starring in his films Gone Baby Gone (2007), The Town (2010), Argo (2012), and Live by Night (2016).

Live by Night is a 2016 American crime drama film written, directed, produced by and starring Ben Affleck. Based on the 2012 novel of the same name by Dennis Lehane, the film follows an ambitious Ybor City bootlegger (Affleck) who becomes a notorious gangster. The film also stars Elle Fanning, Brendan Gleeson, Chris Messina, Sienna Miller, Zoe Saldaña, and Chris Cooper.