- 2004: Featured as Doc Cochran in the HBO drama "Deadwood"; earned an Emmy nomination for Best Supporting Actor in a Drama for 2004
- 2004: Reprised his role as the voice of Chucky in "Seed of Chucky"
- 2003: Appeared in the "The Lord of the Rings: The Return of the King" the last of the three part series
- 2001: Had regular role of a town resident named Frenchy in the PAX-TV prequel series "Ponderosa"
- 2000: Co-starred in "Shadow Hours" as a gas station owner
- 1998: Once again voiced the murderous doll in "Bride of Chucky"
- 1998: Made uncredited appearance in "Urban Legend" as a gas station attendant
- 1997: Was featured in "Alien Resurrection"
- 1994: Made memorable guest appearance on "The X-Files" (Fox)
- 1993: Co-starred in ABC TV miniseries "Wild Palms"
- 1991: Again voiced Chucky in "Child's Play 3"
- 1990: Reprised the voice of Chucky in "Child's Play 2"
- 1988: Co-starred as a killer whose soul possesses a doll in "Child's Play"; also voiced the doll Chucky in the same film
- 1986: Had featured role in Lynch's "Blue Velvet"
- 1985: First collaboration with director David Lynch, "Dune"
- 1982: Cast as a vampire in the ABC movie "I, Desire"
- 1981: Had featured role as the man obsessed with explosives and Evelyn Nesbitt in Milos Forman's "Ragtime"
- 1980: Portrayed a doctor who follows cult leader Jim Jones to South America in "Guyana Tragedy: The Story of Jim Jones" (CBS)
- 1979: Starred in John Huston's "Wise Blood" as an obsessed preacher
- 1979: Appeared in NBC miniseries "Studs Lonigan"
- 1978: Had title role in the NBC movie "Sergeant Matlovich vs. the U.S. Air Force"
- 1976: TV debut in "Great Performances" production of Lanford Wilson's "The Mound Builders" (PBS)
- 1975: Breakthrough feature role, Billy Bibbit in "One Flew Over the Cuckoo's Nest", directed by Milos Forman; earned Oscar nomination as Best Supporting Actor
- 1974: Feature acting debut in "W. W. and the Dixie Dancekings"
- 1972: First major theatrical role in "When You Comin' Back, Red Ryder?" at Circle Rep
- 1970: Moved to NYC; roomed with actress Conchata Ferrell
- 1970: Acted with Circle Repertory Company
- Acted with Greenbriar Repertory in West Virginia
- Cast as Grima Wormtounge in Peter Jackson's film adaptation of J.R.R. Tolkein's "The Lord of the Rings" (filmed 1999-2000); released in three parts over three years: "The Fellowship of the Rings" (2001); "The Two Towers" (2002) and "The Return of the King" (2003)
- Recommended by Forman, taught acting and directing at Columbia University
- Played recurring role of Crewman Suder on the UPN series "Star Trek; Voyager"




