With San Antonio Spurs head coach Greg Popovich stepping down, Pittsburgh Steelers head coach Mike Tomlin will take his place atop an impressive leaderboard.

Pittsburgh Steelers head coach Mike Tomlin is officially the longest-tenured head coach in professional North American sports. After San Antonio Spurs head coach Gregg Popovich stepped down amid health issues at 76, Tomlin has now taken over as the longest-tenured head coach in the main four professional North American sports leagues.

Pittsburgh Steelers head coach Mike Tomlin is now the owner of a rather admirable title. As pointed out by NFL Network's Andrew Siciliano, Tomlin has become th