Duane Charles "Bill" Parcells is a former American football head coach, both in college with the Air Force Falcons, and the National Football League with the New York Giants, New England Patriots, New York Jets, and Dallas Cowboys and is currently a "Courtesy Consultant" for the Cleveland Browns. He is known as "The Big Tuna", a nickname about the shape of his physique derived from a team joke during his tenure as linebackers coach of the New England Patriots.