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).
[6] Feature 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 Magnificent Desolation: Walking on the Moon 3D.
TV movie roles include Into the Homeland, Perry Mason: The Case of the Avenging Ace, The Love She Sought, and The Christmas Pageant.
[7] 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.
[10][11] He and his Twin Peaks co-star Sheryl Lee co-founded the Actor's Director Workshop.