Thomas Edward Sizemore Jr. (born November 29, 1961) is an American film and television actor and producer. He is known for his supporting roles in films such as Born on the Fourth of July (1989), Harley Davidson and the Marlboro Man (1991), Passenger 57 (1992), True Romance (1993), Natural Born Killers (1994), Strange Days (1995), Heat (1995), Saving Private Ryan (1998), Red Planet (2000), Black Hawk Down (2001), Pearl Harbor (2001), and for voicing Sonny Forelli in the video game Grand Theft Auto: Vice City. He also played Joey, Marissa's jealous ex-boyfriend in the film Zyzzyx Road (2006), and Anthony Sinclair in the revival television series Twin Peaks (2017).
Sizemore was born in Detroit, Michigan. His mother, Judith (née Schannault), was a member of the city of Detroit ombudsman staff, and his father, Thomas Edward Sizemore, Sr., was a lawyer and philosophy professor. He was raised Roman Catholic.