Matthew Avery Modine (born March 22, 1959) is an American film actor who rose to prominence through his role as United States Marine Corps Private Joker in Stanley Kubrick's Full Metal Jacket. His other well-known roles include Dr. Martin Brenner in Stranger Things, the title character in Alan Parker's Birdy, high school wrestler Louden Swain in Vision Quest and the oversexed Sullivan Groff on Weeds.