Belichick is so good that his management style gets pored over by business publications and professors in the hopes of translating his rules for success to corner offices. Be prepared, but ready to adjust. Focus on culture. Study your mistakes. When CNBC commentator Suzy Welch, wife of Jack, asked Belichick to describe his leadership principles, he offered several: “Do your job, be attentive, pay attention to details, team has to come first. Even though we all have individual goals and preferences. We don't talk about last year, we don't talk about next week, we don't talk about next year. We talk about today and we talk about the next game.”