Mitch Pileggi played Senator Dresden in the episode Mr. Frost. He is best known for playing Assistant Director Walter Skinner on The X-Files. He has had recurring roles on a number of other television programs, including Grey's Anatomy, Medium, Sons of Anarchy, Supernatural, Stargate: Atlantis, Brothers & Sisters (starring Rob Lowe) and Daybreak (starring Taye Diggs).

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