Film & TV List | Role | Media |
 |
| NCIS (2003–2012) | Special Agent Jethro Gibbs | TV Show |
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| Certain Prey (2011) | Deputy Chief Lucas Davenport | Movie |
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| Justice League: Crisis on Two Earths (2010) | Superman (voice) | Direct to Video |
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| Weather Girl (2009) | Dale | Movie |
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| Chasing Liberty (2004) | President James Foster | Movie |
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| Freaky Friday (2003) | Ryan | Movie |
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| JAG (2003) | Special Agent Jethro Gibbs | TV Show |
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| The West Wing (2002) | Agent Simon Donovan | TV Show |
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| Local Boys (2002) | Jim Wesley | Movie |
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| The Legend of Tarzan (2001) | Bob Markham | TV Show |
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| And Never Let Her Go (2001) | Thomas Capano | TV Movie |
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| Crossfire Trail (2001) | Bruce Barkow | TV Movie |
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| I'll Remember April (2000) | John Cooper | Movie |
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| The Amati Girls (2000) | Lawrence | Movie |
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| For All Time (2000) | Charles Lattimer | TV Movie |
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| Chicago Hope (1996–2000) | Dr. Jack McNeil | TV Show |
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| Fear and Loathing in Las Vegas (1998) | Magazine Reporter | Movie |
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| From the Earth to the Moon (1998) | Wally Schirra | TV Movie |
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| The First to Go (1997) | Jeremy Hampton | Movie |
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| Casualties (1997) | Tommy Nance | Movie |
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| Adventures from the Book of Virtues (1997) | Ulysses | TV Show |
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| Charlie Grace (1995–1996) | Charlie Grace | TV Show |
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| Strangers (1996) | Mark | TV Show |
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| The Last Supper (1995) | Dominant Male | Movie |
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| Magic in the Water (1995) | Jack Black | Movie |
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| Original Sins (1995) | Johnathan Franye | TV Movie |
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| Wyatt Earp (1994) | Sheriff Johnny Behan | Movie |
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| Harts of the West (1993) | Rodeo clown | TV Show |
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| Reasonable Doubts (1991–1993) | Det. Dicky Cobb | TV Show |
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| Cold Heaven (1991) | Alex Davenport | Movie |
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| Till There Was You (1991) | Frank Flynn | Movie |
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| Shadow of a Doubt (1991) | Charles | TV Movie |
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| Long Road Home (1991) | Ertie Robertson | TV Movie |
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| Fourth Story (1991) | David Shepard | TV Movie |
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| Dillinger (1991) | John Dillinger | TV Movie |
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| Kenny Rogers Classic Weekend (1990) | n/a | TV Movie |
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| Worth Winning (1989) | Taylor Worth | Movie |
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| Sweet Bird of Youth (1989) | Chance Wayne | TV Movie |
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| Stealing Home (1988) | Billy Wyatt | Movie |
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| The Presidio (1988) | Jay Austin | Movie |
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| After the Promise (1987) | Elmer Jackson | TV Movie |
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| Summer School (1987) | Mr. Freddy Shoop | Movie |
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| Moonlighting (1987) | Sam Crawford | TV Show |
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| Let's Get Harry (1986) | Harry Burck Jr. | Movie |
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| St. Elsewhere (1983–1986) | Dr. Robert Caldwell | TV Show |
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| The Deliberate Stranger (1986) | Ted Bundy | TV Movie |
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| Prince of Bel Air (1986) | Robin Prince | TV Movie |
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| Tuareg: The Desert Warrior (1984) | Gacel Sayah | Movie |
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| The Love Boat (1979–1983) | Doug Bradbury
/
Rick Tucker | TV Show |
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| Intimate Agony (1983) | Tommy | TV Movie |
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| Flamingo Road (1980–1982) | Fielding Carlyle | TV Show |
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| Goliath Awaits (1981) | Peter Cabot | TV Movie |
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| The Dream Merchants (1980) | Johnny Edge | TV Movie |
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| 240-Robert (1979–1980) | Deputy Dwayne 'Thib' Thibideaux | TV Show |
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| Beyond the Poseidon Adventure (1979) | Larry Simpson | Movie |
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| Centennial (1978–1979) | Captain John McIntosh | TV Movie |
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| Comes a Horseman (1978) | Billy Joe Meynert | Movie |
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| Little Mo (1978) | Norman Brinker | TV Movie |
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| Getting Married (1978) | Howie Lesser | TV Movie |
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| Sam (1977–1978) | Officer Mike Breen | TV Show |
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| The Hardy Boys/Nancy Drew Mysteries (1977) | Chip Garvey | TV Show |
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| Eleanor and Franklin: The White House Years (1977) | Robert Dunlap | TV Movie |
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| Police Story (1976) | Officer Hazelton | TV Show |
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| Delvecchio (1976) | Ronnie Striker | TV Show |
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| Police Woman (1975–1976) | Paul Donin | TV Show |
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| All's Fair (1976) | n/a | TV Show |
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| Laverne & Shirley (1976) | Victor, Jeep Buyer | TV Show |
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| Eleanor and Franklin (1976) | Robert Dunlap | TV Movie |
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| Adam-12 (1975) | Officer Gus Corbin | TV Show |
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| Emergency! (1975) | Ofcr. Dave Gordon | TV Show |
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| Ozzie's Girls (1973) | The Candidate | TV Show |
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Film & TV List | Role | Media |
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| Family Guy (2012) | Himself | TV Show |
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| The Tonight Show with Jay Leno (1992–2012) | Himself | TV Show |
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| Late Show with David Letterman (2011) | Himself | TV Show |
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| The View (2004–2011) | Himself
/
Himself - Guest | TV Show |
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| Entertainment Tonight (2005–2010) | Himself | TV Show |
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| The Late Late Show with Craig Ferguson (2005–2010) | Himself | TV Show |
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| The Jay Leno Show (2010) | Himself | TV Show |
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| The Early Show (2009) | Himself | TV Show |
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| The Daily Show with Jon Stewart (1998–2001) | Himself | TV Show |
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| Saturday Night Live (1987) | Himself - Host
/
Various | TV Show |
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