Film & TV List | Role | Media |
 |
| Law & Order (1994–2010) | Jack McCoy | TV Show |
|
| Law & Order: Special Victims Unit (2000–2010) | Jack McCoy | TV Show |
|
| Masters of Science Fiction (2007) | Havelman | TV Movie |
|
| Law & Order: Trial by Jury (2005) | Jack McCoy | TV Show |
|
| The Commission (2003) | J. Lee Rankin | Movie |
|
| Le divorce (2003) | Chester Walker | Movie |
|
| The Matthew Shepard Story (2002) | Dennis Shepard | TV Movie |
|
| A House Divided (2000) | David Dickson | TV Movie |
|
| Homicide: Life on the Street (1997–1999) | Jack McCoy | TV Show |
|
| Great Books (1999) | Interview | TV Show |
|
| Exiled (1998) | Jack McCoy | TV Movie |
|
| Miracle at Midnight (1998) | Dr. Karl Koster | TV Movie |
|
| Shadow Conspiracy (1997) | The President | Movie |
|
| Thomas Jefferson (1997) | Thomas Jefferson (voice) | TV Movie |
|
| The Proprietor (1996) | Harry Bancroft | Movie |
|
| The Journey of August King (1995) | Mooney Wright | Movie |
|
| Serial Mom (1994) | Eugene Sutphin, D.D.S. | Movie |
|
| David's Mother (1994) | John Nils | TV Movie |
|
| Assault at West Point: The Court-Martial of Johnson Whittaker (1994) | Daniel Chamberlain | TV Movie |
|
| The Enemy Within (1994) | President William Foster | TV Movie |
|
| I'll Fly Away: Then and Now (1993) | Forrest Bedford | TV Movie |
|
| Tales from the Crypt (1993) | G.G. Devoe | TV Show |
|
| I'll Fly Away (1991–1993) | Forrest Bedford | TV Show |
|
| A Captive in the Land (1993) | Royce | Movie |
|
| Warburg: A Man of Influence (1992) | Siegmund Warburg | TV Movie |
|
| The Man in the Moon (1991) | Matthew Trant | Movie |
|
| Lantern Hill (1990) | Andrew Stuart | TV Movie |
|
| Mindwalk (1990) | Jack Edwards | Movie |
|
| The Civil War (1990) | President Abraham Lincoln | TV Movie |
|
| Crimes and Misdemeanors (1989) | Ben | Movie |
|
| Welcome Home (1989) | Woody | Movie |
|
| The Nightmare Years (1989) | Bill Shirer | TV Movie |
|
| The American Experience (1988) | Narrator | TV Show |
|
| Lincoln (1988) | Abraham Lincoln | TV Movie |
|
| Terrorist on Trial: The United States vs. Salim Ajami (1988) | Jim Delmore | TV Movie |
|
| A Walk in the Woods (1988) | John Honeyman | TV Movie |
|
| September (1987) | Peter | Movie |
|
| Devil's Paradise (1987) | Jones | Movie |
|
| The Room Upstairs (1987) | Travis Coles | TV Movie |
|
| Visionaries: Knights of the Magical Light (1987) | Host
/
narrator | TV Show |
|
| Flagrant désir (1986) | Inspecteur Gerry Morrison | Movie |
|
| Just Between Friends (1986) | Harry Crandall | Movie |
|
| Amazing Stories (1986) | Jordan Manmouth | TV Show |
|
| The Fifth Missile (1986) | Capt. Allard Renslow | TV Movie |
|
| Warning Sign (1985) | Cal Morse | Movie |
|
| Love Lives On (1985) | Bernie | TV Movie |
|
| Finnegan Begin Again (1985) | Paul Broadbent | TV Movie |
|
| The Killing Fields (1984) | Sydney Schanberg | Movie |
|
| The Boy Who Loved Trolls (1984) | Ofoeti | TV Movie |
|
| Dempsey (1983) | Doc Kearns | TV Movie |
|
| In Defense of Kids (1983) | Paul Wilcox | TV Movie |
|
| Games Mother Never Taught You (1982) | David Bentells | TV Movie |
|
| Q.E.D. (1982) | Prof. Quentin E. Deverill | TV Show |
|
| Freedom to Speak (1982) | Theodore Roosevelt | TV Movie |
|
| Oppenheimer (1980) | Robert Oppenheimer | TV Movie |
|
| Heaven's Gate (1980) | Frank Canton | Movie |
|
| Hopscotch (1980) | Cutter | Movie |
|
| Sweet William (1980) | William McClusky | Movie |
|
| Eagle's Wing (1979) | White Bull | Movie |
|
| Friendly Fire (1979) | C.D. Bryan | TV Movie |
|
| Interiors (1978) | Mike | Movie |
|
| Capricorn One (1977) | Peter Willis | Movie |
|
| Sweet Revenge (1976) | Le Clerq | Movie |
|
| Journey Into Fear (1975) | Mr. Graham | Movie |
|
| Rancho Deluxe (1975) | Cecil Colson | Movie |
|
| Reflections of Murder (1974) | Michael Elliott | TV Movie |
|
| The Great Gatsby (1974) | Nick Carraway | Movie |
|
| The Glass Menagerie (1973) | Tom Wingfield | TV Movie |
|
| Much Ado About Nothing (1973) | Benedick | TV Movie |
|
| Savages (1972) | James, the Limping Man | Movie |
|
| Mahoney's Estate (1972) | Felix | Movie |
|
| NET Playhouse (1971) | n/a (segment Foul!) (segment Foul!) | TV Show |
|
| Who Killed Mary Whats'ername? (1971) | Alex | Movie |
|
| Cover Me Babe (1970) | Cameraman | Movie |
|
| Three (1969) | Taylor | Movie |
|
| Generation (1969) | Desmond | Movie |
|
| Fitzwilly (1967) | Oliver | Movie |
|
| N.Y.P.D. (1967) | Marco | TV Show |
|
| Camera Three (1966) | Man 2 | TV Show |
|
| Dr. Kildare (1965) | Mark | TV Show |
|
| The Plastic Dome of Norma Jean (1965) | Andy | Movie |
|
Film & TV List | Role | Media |
|
| The Colbert Report (2008) | Himself | TV Show |
|
| The View (2008) | Himself | TV Show |
|
| Saturday Night Live (1995) | Himself | TV Show |
|