Since I released my book Principles: Life & Work, several remarkably successful people from all walks of life contacted me telling me that they used basically the same principles across domains and asked me if I would brainstorm with them about principles for success. Here’s a preview of my first such conversation, with one of the greatest football coaches and team builders in history, Bill Belichick, who just earned his 300th career win. In our conversation, we discuss our principles for buildi