After the Seattle Seahawks parted ways with longstanding coach Pete Carroll on Wednesday,
the New England Patriots did the same with famous coach Bill Belichick. Just like that,
two of the league's longest-tenured and most successful coaches have left the organizations they helped win championships.
Carroll and Belichick have left their respective teams, so the list of the league's longest-tenured coaches looks rather different now.
Notably, in his seventh season as Buffalo Bills coach, Sean McDermott is now tied with Sean McVay of the Los Angeles Rams and Kyle Shanahan of the San Francisco 49ers for the fourth-longest tenure in the NFL.
Mike Tomlin of the Pittsburgh Steelers, whom the Bills will face in the Wild Card Round on Sunday, is now the league's longest-tenured coach, having served for 17 seasons.
John Harbaugh of the Baltimore Ravens is just behind Tomlin with 16 years, and Andy Reid of the Kansas City Chiefs is third with 11 seasons.
Since his arrival in 2017, McDermott has helped to fundamentally transform the franchise.
The Bills had not made the playoffs in the twenty-first century before McDermott arrived,