Mark Rolston played Alastair in season four of Supernatural. Rolston was born December 7, 1956 in Baltimore, Maryland. He knew he wanted to be an actor from a young age, and traveled to Europe to pursue his career. studying for five years at the London Drama Center.
Rolston has a number of hit film credits under his belt including Aliens (1986), Leathal Weapon 2 (1989), The Shawshank Redemption (1994), Rush Hour (1998) and Martin Scorsese's The Departed (2006). He also took on the role of "Dan Erickson" in the last two installments in the cult Saw film series Saw V and Saw: The Final Chapter released in 2008 and 2009 respectively.
Rolston has had numerous other recurring guest spots on television, appearing in episodes of 24, CSI: Miami, Cold Case, The Shield; not to mention appearances on The X Files, Angel, Dark Angel, Alias, Reaper & Lie to Me.