Pileggi's later work has included starring in the short-lived TV show "Tarzan" and co-starring with Barbara Hershey and Oliver Hudson in the short-lived TV show "The Mountain". He played the recurring role of character Colonel Steven Caldwell, Commander of the Earth Battlecruiser, "Daedalus", in the second (2005) and subsequent seasons of the television series "Stargate Atlantis". He also appeared in an episode of "" and in 2006 had a regular guest role on "Day Break" as Robbery/Homicide Detective Spivak. Pileggi also appeared on the show "Cold Case" in the episode "Offender", as a father accused of molesting and murdering his own son, who then threatens to murder one child sex offender per day until the case is reopened and solved. Pileggi also played the role of Larry Jennings, chairman of the board of the hospital, in "Grey's Anatomy". In a first season episode of "That '70s Show" he played Red Forman's swinger, navy buddy, Bull, alongside his real life wife, Arlene.