
J.G. Hertzler
Acting • Born 1949-03-18
Biography
John Garman Hertzler Jr. (born March 18, 1950, in Savannah, Georgia) is an American actor, author, screenwriter, and activist best known for his role as the Klingon General (later Chancellor) Martok on Star Trek: Deep Space Nine, a role he played from 1995 until the series ended in 1999. Hertzler began his acting career in the 1970s, primarily in stage acting and some films, eventually guest-starring in TV shows before landing a major role in the 1990s series Zorro as Alcalde Ignacio De Soto. Beyond Deep Space Nine, he appeared in several other Star Trek shows, wrote two Star Trek novels, and frequently appeared at science fiction conventions. He grew up mostly around Washington, D.C., attended Bucknell University (earning a degree in political science), pursued a master's in set design at the University of Maryland, and even attended law school briefly. His early career included theater in Washington, New York, San Francisco, and Southern California, with roles spanning Shakespeare and other dramatic works, as well as some film appearances. Hertzler lives in the Finger Lakes region of New York, where he has lectured at Cornell University’s theater department and has been active in local politics and writing screenplays. His filmography includes notable appearances outside of Star Trek, such as Quantum Leap, Zorro, Highlander, and others.
Filmography
34 credits
Treasure Island: The Adventure Begins
Movie • 1994
Black Dog

Pirates of Silicon Valley
Movie • 1999
Ridley Scott

Star Trek: Deep Space Nine - The Way of the Warrior
Movie • 1995
Martok

Prelude to Axanar
Movie • 2014
Captain Samuel Travis

The Circuit
Movie • 2019

Star Trek: Of Gods and Men
Movie • 2007
Koval

40 Years of Star Trek
Movie • 2006
Self

What We Left Behind: Looking Back at Star Trek: Deep Space Nine
Movie • 2018
Self

The Prophecy II
Movie • 1998
Father William

...And Justice for All
Movie • 1979
Driver

InAlienable
Movie • 2008
Dr. Lattis

Six Feet Under
TV • 2001
Gallery Owner

Seinfeld
TV • 1989
Director

Star Trek: Enterprise
TV • 2001
Advocate Kolos

The Adventures of Brisco County, Jr.
TV • 1993
Edward Hayes

Star Trek: Voyager
TV • 1995
Hirogen Hunter

Everybody Loves Raymond
TV • 1996
Everett Munce

Charmed
TV • 1998
Council Member

Quantum Leap
TV • 1989
Weathers Farrington

Dr. Quinn, Medicine Woman
TV • 1993
Capt. Burgoyne

Roswell
TV • 1999
Mr. Lafeber

Diagnosis: Murder
TV • 1993
Mr. Smith

Zorro
TV • 1990
Alcalde Ignacio de Soto

Star Trek: Deep Space Nine
TV • 1993
Martok

A Captain's Log
TV • 2021
Self

Star Trek: Enterprise
TV • 2001
Klingon Captain

Star Trek: Deep Space Nine
TV • 1993
Vulcan Captain

Star Trek: Lower Decks
TV • 2020
Martok (voice)

Highlander: The Series
TV • 1992
Marcus Korolus

Star Trek: Deep Space Nine
TV • 1993
Martok / Roy Ritterhouse

Star Trek: Deep Space Nine
TV • 1993
Laas

Sabrina, the Teenage Witch
TV • 1996
Plato

Lois & Clark: The New Adventures of Superman
TV • 1993
Trey

Star Trek: Lower Decks
TV • 2020
Drookmani Captain (voice)