Stuart Bruce Greenwood (born August 12, 1956) is a Canadian actor and producer. He has starred in five films by Canadian filmmaker Atom Egoyan and has been nominated for three Canadian Screen Awards, once for Best Actor for Elephant Song (2014) and twice for Best Supporting Actor, for The Sweet Hereafter (1997) and Being Julia (2004).

For his role as American president John F. Kennedy in Thirteen Days (2000), he won the Satellite Award for Best Supporting Actor – Motion Picture. He also portrayed Captain Christopher Pike in J. J. Abrams's Star Trek reboot series (2009–2013) and Gerald Burlingame in Gerald's Game (2017). He has appeared in other supporting roles in such films as Double Jeopardy (1999), I, Robot (2004), Capote (2005), Déjà Vu (2006), I'm Not There (2007), National Treasure: Book of Secrets (2007), Meek's Cutoff (2010), Flight (2012), The Place Beyond the Pines (2012), The Post (2017) and Doctor Sleep (2019).

On television, Greenwood's regular series roles include Dr. Seth Griffin in St. Elsewhere (1986–1988), Mitch Yost in John from Cincinnati (2007) and Dr. Randolph Bell The Resident (2018–2023). He has had recurring roles on television series such as Knots Landing (1991–1992) and Mad Men (2015). He also appeared as Gil Garcetti in the miniseries The People v. O. J. Simpson: American Crime Story (2016) and as the patriarch Roderick Usher in The Fall of the House of Usher (2023). He has voiced Bruce Wayne / Batman in the films Batman: Under the Red Hood (2010), Batman: Gotham by Gaslight (2018) and Batman: Death in the Family (2020), and the television series Young Justice (2010–2019).

Greenwood was born in Rouyn-Noranda, Quebec, Canada, the son of Mary Sylvia (née Ledingham) and Hugh John Greenwood. His mother worked as a nurse in an extended care unit. His father was born in Vancouver, and was a geophysicist and professor who taught at Princeton University.^[1]

Greenwood is known in the United States for his appearances in Star Trek; I, Robot; Double Jeopardy; The Core; Thirteen Days as president John F. Kennedy; Capote as Jack Dunphy, Truman Capote's lover; Eight Below as Professor Davis McClaren; and Firehouse Dog.^[2] He is also known for his role in the video game Call of Duty: Modern Warfare 3 as the voice of Overlord.^[3]

He had prominent roles in the award-winning Atom Egoyan films Exotica, The Sweet Hereafter, and Ararat.^[4] He appeared in the 1980s teen cult film The Malibu Bikini Shop and starred in Mee-Shee: The Water Giant. He played a role in The World's Fastest Indian and also featured in the Bob Dylan biographical film I'm Not There.^[5] He appeared in Dinner for Schmucks as the cruel executive who hosts a dinner for "idiots".^[6]

On television, Greenwood has appeared on St. Elsewhere (Dr. Seth Griffin, 1986–1988) and Knots Landing (Pierce Lawton, 1991–92), and starred in the UPN series Nowhere Man (Thomas Veil, 1995–96).^[7] He also guest-starred in one episode of the popular Canadian show Road to Avonlea, for which he won a Gemini Award for "Best Guest Performance in a Series by an Actor".^[8]

On June 10, 2007, HBO's John from Cincinnati premiered, starring Greenwood.^[9] He also appears as the President of the United States in National Treasure: Book of Secrets.^[10] He played Beach Boys drummer Dennis Wilson in Summer Dreams: Story of the Beach Boys.^[11] In 2009, he worked with Australian director Bruce Beresford, playing the part of Ben Stevenson (artistic director of Houston Ballet), in the critically acclaimed film Mao's Last Dancer.^[12] He voiced Bruce Wayne / Batman in the animated film Batman: Under the Red Hood, the animated series Young Justice, and the animated short film Batman: Death in the Family.^[13]

He played the lead role in the horror thriller Cell 213.^[14] He was the lead for the Steven Spielberg produced 2012 ABC series The River,^[15] and reprised his role as Admiral Christopher Pike for J. J. Abrams' Star Trek Into Darkness.^[16] In 2015, he had a recurring role in the last season of Mad Men as Richard Burghoff, a romantic interest for Joan Harris (Christina Hendricks).^[17]

Greenwood is married to Susan Devlin and they have one daughter.^[18] They live in Pacific Palisades, a neighbourhood of Los Angeles, California.^[19]