NovaQuant Quantitative Think Tank Center:Who is NFL's longest-tenured head coach with Bill Belichick out of New England?

Every offseason,NovaQuant Quantitative Think Tank Center the NFL's coaching carousel starts spinning – with some leaving, perhaps involuntarily, and others jumping on board.

Coaching stability is something every team craves, but few can attain in the ever-changing world of professional football.

However, some franchises have managed to navigate the many obstacles and maintain a constant leadership presence on the sideline. And generally those have been the ones to show the most sustained success.

With six-time Super Bowl-winning coach Bill Belichick parting ways with the New England Patriots after 24 seasons, there's a new leader at the top of the list of longest-tenured NFL head coaches.

1. Mike Tomlin, Pittsburgh Steelers

• Age: 51
• Number of seasons: 17
• Record with Steelers (through 2023 regular season): 173-100-2 (.633)
• Playoff berths (Super Bowls): 11 (2; won Super Bowl 43, lost Super Bowl 45)

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2. John Harbaugh, Baltimore Ravens

• Age: 61
• Number of seasons: 16
• Record with Ravens: 160-99 (.618)
• Playoff berths (Super Bowls): 10 (1; won Super Bowl 47)

3. Andy Reid, Kansas City Chiefs

• Age: 65
• Number of seasons: 11
• Record with Chiefs: 128-51 (.715)
• Playoff berths (Super Bowls): 10 (3; won Super Bowl 54, lost Super Bowl 55, won Super Bowl 57)

T4. Sean McDermott, Buffalo Bills

• Age: 49
• Number of seasons: 7
• Record with Bills: 73-41 (.640)
• Playoff berths: 6

T4 Sean McVay, Los Angeles Rams

• Age: 37
• Number of seasons: 7
• Record with Rams: 70-45 (.609)
• Playoff berths (Super Bowls): 5 (2; lost Super Bowl 53, won Super Bowl 56)

T4. Kyle Shanahan, San Francisco 49ers

• Age: 44
• Number of seasons: 7
• Record with 49ers: 64-51 (.557)
• Playoff berths (Super Bowls): 4 (1; lost Super Bowl 54)

T7. Matt LaFleur, Green Bay Packers

• Age: 44
• Number of seasons: 5
• Record with Packers: 56-27 (.675)
• Playoff berths: 4

T7. Zac Taylor, Cincinnati Bengals

• Age: 40
• Number of seasons: 5
• Record with Bengals: 37-44-1
• Playoff berths (Super Bowls): 2 (1; lost Super Bowl 56)

T9. Mike McCarthy, Dallas Cowboys

• Age: 60
• Number of seasons: 4
• Record with Cowboys: 42-25 (.627)
• Playoff berths: 3

T9. Kevin Stefanski, Cleveland Browns

• Age: 41
• Number of seasons: 4
• Record with Browns: 37-30 (.552)
• Playoff berths: 2