Duane Charles "Bill" Parcells is an American former football coach who served as a head coach in the National Football League (NFL) for 19 seasons. He came to prominence as the head coach of the New York Giants from 1983 to 1990, winning two Super Bowl titles. Parcells was later the head coach of the New England Patriots from 1993 to 1996, the New York Jets from 1997 to 2000, and the Dallas Cowboys from 2003 to 2006. Nicknamed "the Big Tuna", he is the only NFL coach to lead four different franchises to the playoffs and three to a conference championship game.
As the head coach of the Giants, Parcells took over a franchise that had qualified for the playoffs only once in the past decade and had only one winning record in their last 10 seasons. Within four years, he guided them to their first Super Bowl title and won a second championship in Super Bowl XXV four years later. Parcells retired following the second Super Bowl, but came out of retirement in 1993 to become the head coach of the Patriots, another struggling franchise at the time. By his fourth season, New England reached Super Bowl XXXI, although the game ended in defeat.