Greg Popovich, the legendary San Antonio Spurs head coach, has officially stepped down from his coaching role, marking the end of an era in the NBA. After a series of health concerns, including a mild stroke, Popovich will transition to the position of president of basketball operations. His career resulted in five NBA championships and numerous accolades, forever impacting the game. This change brings attention to the Pittsburgh Steelers' Mike Tomlin, now the longest-tenured active coach across North American sports. Tomlin, who has led the Steelers since 2007, has yet to have a losing season, despite not winning a playoff game since 2016. With his contract extension and the Steelers' history of stability in coaching, Tomlin seems poised to maintain his legacy.