At the start of the 2025 NFL season, Mike Tomlin, John Harbaugh, and Andy Reid are the longest-tenured active coaches in the league. Tomlin has coached the Pittsburgh Steelers for 19 years, Harbaugh has represented the Baltimore Ravens for 18 years, and Reid has led the Kansas City Chiefs for 13 years.
Let's look back at the longest-tenured head coaches in NFL history.
T1. Curly Lambeau, Packers: 29 seasons (1921-49)
Lambeau founded the Green Bay Packers in 1919 and played 10 seasons with the team before becoming a player-coach in 1929.