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Gary Hershberger (born April 5, 1964) is an American actor and screenwriter. He is best known for his television roles as Mike Nelson in Twin Peaks (1989–1991; 2017) and Matthew Gilardi on Six Feet Under (2001–2002).
Film roles include a mix of starring and supporting roles in Paradise Motel, My Man Adam, Free Ride, Beverly Hills Madam, Burglar, The Siege of Firebase Gloria, The Heroes of Desert Storm, Forever Love, Deep Core, Sneakers, Faith, Hope & Love, One Man's Hero, and the IMAX documentary . TV movie roles include Into the Homeland, , The Love She Sought, and The Christmas Pageant.
Hershberger has appeared in episodes of Grey's Anatomy, The West Wing, Murder, She Wrote, Columbo, The OC, JAG, Knight Rider, Highway to Heaven, China Beach, and the pilot episode of The Whispers.
He and his Twin Peaks co-star Sheryl Lee co-founded the Actor's Director Workshop. They have taught at the University of Southern California, UCLA, Pepperdine, and Loyola Marymount University.
His production company is called Deer Mountain Productions.
| + ! Year ! Title ! Role ! class="unsortable" | Notes | ||
| 1985 | Paradise Motel | Sam Kehoe | |
| 1985 | My Man Adam | Stan | |
| 1986 | Free Ride | Dan Garten | |
| 1987 | Burglar | Young Officer | |
| 1989 | The Siege of Firebase Gloria | Moran | |
| 1992 | Mike Nelson | ||
| 1992 | Sneakers | College-Aged Bishop | |
| 1996 | Last Resort | Night Eagle | |
| 1999 | One Man's Hero | Eammon Daly | |
| 2000 | Deep Core | Henry | |
| 2000 | The Amati Girls | Kevin | |
| 2001 | New Alcatraz | Goodman | |
| 2005 | Astronaut Grace | ||
| 2014 | Mike Nelson | ||
| 2019 | Faith, Hope & Love | Tommy | |
| 2020 | Magic Max | Mike |
| 1984 | Summer | Alex Pierce | Television film |
| 1985 | Knight Rider | Nicholas Arkett | Episode: "The Wrong Crowd" |
| 1985 | Tales from the Darkside | Jeff | Episode: "Effect and Cause" |
| 1986 | Beverly Hills Madam | Justin | Television film |
| 1986 | Highway to Heaven | Danny | Episode: "Code Name: FREAK" |
| 1987 | Tonight's the Night | Ronnie | Television film |
| 1987 | Into the Homeland | Whitey | |
| 1988 | Terrorist on Trial: The United States vs. Salim Ajami | Marine Guard | |
| 1988 | Perry Mason: The Case of the Avenging Ace | Lieutenant Wilkins | |
| 1988 | 21 Jump Street | Michael McCarter | Episode: "Hell Week" |
| 1989 | Coach | Carter Frederickson | Episode: "Whose Team Is It, Anyway?" |
| 1989 | China Beach | Episode: "Vets" (archive footage) | |
| 1989–1991 | Twin Peaks | Mike Nelson | 13 episodes |
| 1990 | A Green Journey | Randy Meers | Television film |
| 1990 | Columbo | Cooper Redman | Episode: "Columbo Goes to College" |
| 1991 | The Heroes of Desert Storm | Capt. Steve Tate | Television film |
| 1991 | The Trials of Rosie O'Neill | Shane Gray / Wade Robert Cameron | Episode: “Happy Birthday or Else” |
| 1993 | Class of '96 | Nathan | Episode: "Midterm Madness" |
| 1993, 1994, 1996 | Murder, She Wrote | Timothy Flint / Rob MacKenzie /
Dave Perrin | 3 episodes |
| 1994 | Renegade | Deputy Morgan | Episode: "The Posse" |
| 1997 | Sleeping with the Devil | Jim | Television film |
| 1998 | Forever Love | Chuck | |
| 1998 | Cupid | Gabe | Episode: "End of an Eros" |
| 1998, 2000 | JAG | Rodney Conger / Commander Crowley | 2 episodes |
| 1999 | Martial Law | Henry Riggins | Episode: "Trifecta" |
| 1999 | Pacific Blue | Bartender Jim | 2 episodes |
| 2000 | Chicago Hope | Daniel O'Connor | Episode: "Miller Time" |
| 2000 | The West Wing | Jerry | Episode: "In the Shadow of Two Gunmen: Part I" |
| 2001 | Family Law | Abe Fitzhugh | Episode: "All in the Family" |
| 2001–2002 | Six Feet Under | Matthew Gilardi | 8 episodes |
| 2004 | Century City | Maxwell Pace | Episode: "Without a Tracer" |
| 2005 | The O.C. | Tom MacGinty | Episode: "The O.C. Confidential" |
| 2007 | Grey's Anatomy | Doug | 2 episodes |
| 2011 | Big Love | Bob Chetney | Episode: "Winter" |
| 2011 | The Christmas Pageant | Zach Wilson | Television film |
| 2012 | Blackout | Bradford Langdon | Episode: "Part I" |
| 2015 | The Whispers | President Chip Winters | Episode: "X Marks the Spot" |
| 2017 | Mike Nelson | Episode: "Part 5" |
| + ! Year ! Title ! class="unsortable" | Notes | |
| 2000 | Python | Television film |
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