Terry O'Quinn

Other prominent television roles include Peter Watts in Millennium (1996–1999), FBI Asst. Director Kendall in Alias (2002–2004), Commander Joe White in Hawaii Five-0 (2011–2018), and Tom Tavner in Patriot (2015–2018).

O'Quinn was born at War Memorial Hospital in Sault Ste. Marie, Michigan, one of 11 siblings, and grew up in nearby Newberry, Michigan. He is of Irish descent and was raised Catholic. He attended Central Michigan University in Mount Pleasant, Michigan, and the University of Iowa in Iowa City. He changed his surname from Quinn to O'Quinn as another registered actor already had the name Terrance Quinn. In the 1970s, O'Quinn went to Baltimore to act in the Center Stage production of Tartuffe. He remained at Center Stage for several years and often appeared with the late Tana Hicken, most notably as Benedick to her Beatrice in Much Ado About Nothing. His first movie role was in Heaven's Gate.

O'Quinn began acting in the 1970s during his time at Central Michigan University. He not only was an actor but also playwright/director. He wrote and directed the musical Orchestrina. This musical featured five main characters: The Man (played by Jeff Daniels), The Boy (Harold Downs), The Woman (Ann O'Donnell), The Girl (Debbie Penwarden), and The Drunk (James Hilliker), plus a female and a male chorus. He was roommates at CMU with actor Brad Slaight. Starting in 1980, O'Quinn has appeared in various feature films such as Silver Bullet, Tombstone, Heaven's Gate, Young Guns, Ghosts of Mississippi, with Rutger Hauer in Blind Fury, and as Howard Hughes in The Rocketeer. O'Quinn also appeared in the Canadian horror movie, Pin (1988) alongside British-born Canadian actor, David Hewlett. His early television roles include guest appearances on Tales of the Unexpected (episode "In the Bag"), Miami Vice (episode "Give a Little, Take a Little"), Moonlighting, Star Trek: The Next Generation (episode "The Pegasus"), The Twilight Zone (1985 revival; episode "Chameleon"), Homicide: Life on the Street (episode "Hate Crimes"), a recurring role on Earth 2, another recurring role as Captain (later Rear Admiral) Thomas Boone on JAG, as well as Colonel Will Ryan in episode 15 of season 1 on the JAG spin-off series NCIS (episode "Enigma"). Around 1995, O'Quinn made guest appearances in The X-Files and Harsh Realm, produced by Chris Carter, who also cast him in the film The X-Files: Fight the Future and then once again in the final season. In 1996, O'Quinn started acting as Peter Watts in the television series Millennium, also produced by Chris Carter. O'Quinn held this role for all three seasons of the series. O'Quinn holds the distinction of having played four different characters within the extended X-Files/Millennium continuum (the two shows being classed together since both Lance Henriksen's character of Frank Black and Charles Nelson Reilly's character of Jose Chung have appeared in both shows).

After a string of recurring appearances on Alias (2002–2003), as the FBI Director Kendall, O'Quinn became a favorite of television producer J. J. Abrams. Following a seven-episode guest run on The West Wing in 2003–2004, O'Quinn received a call from Abrams indicating that the producer wanted to cast him in his new television drama Lost without any audition. In 2005, O'Quinn received an Emmy nomination for Best Supporting Actor in a Drama for his work as John Locke on the series Lost. O'Quinn admitted on the TV Guide Channel that he did not have much faith in Lost at first, calling it "The Mysterious Gilligan's Island of Dr. Moreau". The show, however, became one of the most popular on television, and on September 16, 2007, he won an Emmy Award for Outstanding Supporting Actor in a Drama Series for his role, and was nominated again for an Emmy for the role in 2010, which he did not win. In a TV.com interview O'Quinn commented that the reason he felt comfortable playing this character is because he's a bit like him.

O'Quinn has made a number of television appearances since Lost. From 2012 to 2013, O'Quinn starred in the short-lived series 666 Park Avenue as Gavin Doran. In 2012, he appeared in the second season of Falling Skies. Additionally, O’Quinn starred for two seasons in Amazon Studios' Patriot. In 2016, it was announced that O'Quinn would be joining the second season of Secrets and Lies. In 2019, O'Quinn starred in the only season of Perpetual Grace, LTD on Epix. In February 2021, it was announced that O'Quinn was cast as Martin Queller in the Netflix thriller series Pieces of Her, which is adapted from the Karin Slaughter novel of the same name. In October 2023, during New York Comic Con, it was announced that he would play the antagonist Major General Beale in The Walking Dead: The Ones Who Live, created by Scott M. Gimple. Terry joined the Cameo platform shortly after its launch in 2017, creating videos for fans and donating all of the proceeds to the Virginia Beach SPCA.