Bill Belichick
Belichick started coaching in 1975. In 1985, he became the coach for the New York Giants' defense. He worked with Bill Parcells on the Giants. Parcells and Belichick won two Super Bowls together. In 1991, Belichick left the Giants. He became the head coach of the Cleveland Browns. He coached the Browns for five seasons. He was fired from the Browns in 1995. He joined the New York Jets, but left the team after one day. He became the head coach of the New England Patriots on January 27, 2000.