Tom Landry was an American football player and coach. He is ranked as one of the greatest and most innovative coaches in NFL history, creating many new formations and methods. He invented the now popular 4–3 defense, and the "flex defense" system made famous by the "Doomsday Defense" squads he created during his 29 year tenure with the Dallas Cowboys. Landry won two Super Bowl titles (VI, XII), 5 NFC titles, 13 Divisional titles, and compiled a 270-178-6 record, the 3rd most wins of all time for an NFL coach. His 20 career playoff victories are the most of any coach in NFL history.