Stuart Bruce Greenwood (born August 12, 1956) is a Canadian actor and producer. He is known for his role as the American president John F. Kennedy in Thirteen Days, for which he won the Satellite Award for Best Supporting Actor – Motion Picture, and as Captain Christopher Pike in J. J. Abrams's Star Trek reboot series. He has been nominated for three Canadian Screen Awards, once for Best Actor (for Elephant Song) and twice for Best Supporting Actor (for The Sweet Hereafter and Being Julia). In television, Greenwood starred as Gil Garcetti in The People v. O. J. Simpson: American Crime Story, and has appeared in Mad Men, St. Elsewhere, Knots Landing, and John from Cincinnati. He played Gerald Burlingame in director Mike Flanaghan's Netflix's adaptation of Gerald's Game and Dr. John Dalton in 2019 film adaptation of Doctor Sleep.