 I decided to do the book. It was about three years in the making. It's done along with Greg Cosell and Dave Plout from NFL Films, who are basically NFL Films historians. Through the years, a lot of guys sit in the bar having a cold adult beverage and start talking about games and the game of today. We would do that almost every day at NFL Films. We started talking about schemes and design and how the game is played today. We said, hey, you know what would be cool?