Robert Patrick, born November 5, 1958 in Marietta, Georgia, USA, is an actor. He stars as Master Chief Joseph Prosser in the first season. He has been active since 1986 and his first major breakthrough was playing the T-1000 in Terminator 2: Judgment Day (1991). He has appeared in the films Cop Land (1997), Walk the Line (2005), and Bridge to Terabithia (2007). He has also starred in the series The Unit and The X-Files and had recurring roles in The Sopranos and True Blood.
He had a recurring role in the HBO drama The Sopranos as hapless gambling addict Davey Scatino in 2000. He starred in the later seasons of the science fiction drama The X-Files as agent John Doggett from 2000 to 2002. He starred in the earlier CBS military drama The Unit from 2006 to 2009. He has also had a recurring role in the HBO series True Blood as Jackson Herveaux, the father of main character Alcide Herveaux, in 2012.