10. Bill Parcells (1983-2006) was an NFL head coach for 19 seasons. He rose to prominence as the head coach of the New York Giants, whom he led to two Super Bowl titles. Parcells later served as the head coach of the New England Patriots, New York Jets, and Dallas Cowboys. Throughout his career, he coached teams that were in a period of decline and turned them into postseason contenders. He is the only coach in NFL history to lead four different teams to the playoffs and three different teams to a conference championship game
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