Mike Tomlin became the longest-tenured active head coach in the NFL in 2024 when Bill Belichick and the New England Patriots parted ways. One year later, he is now the longest-tenure active head coach in all of American professional sports. Longtime San Antonio Spurs head coach Gregg Popovich has stepped down as the head coach after a 29-season run. Hat tip to Andrew Siciliano on X for pointing out this impressive stat.
With Greg Popovich stepping down, Mike Tomlin is now the longest-tenured head coach in the four major North American sports.