Michael Ontkean is a Canadian actor best known for his role as Sheriff Harry S. Truman in the cult television series Twin Peaks, from 1990-1991.
Ontkean was one of only four actors who appeared in all 30 episodes of Twin Peaks. The other three were Kyle MacLachlan (Special Agent Dale Cooper), Richard Beymer (Benjamin Horne) and Lara Flynn Boyle (Donna Hayward).
His best known early television role was as Officer Willie Gillis in the series The Rookies, from 1972 to 1976.
He has had recurring roles on other television shows such as The Outer Limits and North Shore, and has had guest appearances on Ironside; Disneyland; The Hitchhiker; Tales Of The Unexpected and PSI Factor: Chronicles of the Paranormal.
Movies he has appeared in include Street Justice (1989); Postcards From The Edge (1990); Nico The Unicorn (1998); Just A Little Harmless Sex (1999); and Bear with Me (2000).