Mitch Pileggi is an American actor best known for his role as Walter Skinner on The X-Files. He also had a recurring role on Stargate Atlantis as Colonel Steven Caldwell and on Supernatural as Samuel Campbell/Azazel. In 2008, he began a recurring role as Ernest Darby in Sons of Anarchy.
Perhaps Pileggi’s most notable role was as the surly Assistant Director Walter Skinner on The X-Files. Skinner first appeared in the episode Tooms in 1994 as a recurring role. The part expanded due to the character and actor’s popularity, and in 2001 he became a series regular and gradually became the most integral character besides Mulder and Scully. He also portrayed the character in The X-Files: Fight the Future (1998) and in The X-Files: I Want to Believe (2008). He also reprised the role in the 2016 miniseries.
From 2005- 2009 Pileggi appeared in the recurring role of Colonel Steven Caldwell, Commander of the Earth Battlecruiser, Daedalus, in Stargate Atlantis. In 2008, Pileggi was cast as Ernest Darby, the head of a white supremacist gang called the “Nordics”, in the critically acclaimed FX drama Sons of Anarchy. Pileggi played Samuel Campbell aka Azazel in the hit CW series Supernatural in the 2008 and 2010/2011 . He is currently in Nova Scotia shooting the horror thriller Polaroid, the latest movie from the producers of The Ring and The Grudge.