10 longest tenured coaches in NFL history, from Mike Tomlin to Bill Belichick Being a head coach in the NFL usually comes with a high-rate of turnover. But some head coaches have managed to become staples of their franchises. Original Source: https://www.sportingnews.com/us/nfl/news/longest-tenured-coaches-nfl-history/6eae8b7344d83b4abec9f3b7
