Jonathan Gannon, born January 4, 1983, in Cleveland, Ohio, is an American football coach currently serving as the defensive coordinator for the Green Bay Packers of the NFL.[1][7] A former safety at the University of Louisville, where a hip injury ended his playing career early, Gannon began coaching at his alma mater before entering the NFL in 2007 as a defensive quality control coach for the Atlanta Falcons.[1][4][6] His early NFL roles included scouting for the St. Louis Rams (2009-2011), defensive quality control with the Tennessee Titans (2012-2013), and defensive assistant positions with the Minnesota Vikings (2014-2017) and Indianapolis Colts (2018-2020).[1][2] Gannon rose to prominence as the Philadelphia Eagles' defensive coordinator from 2021-2022, where his unit ranked top-10 in total defense both seasons, led the NFL with 99 sacks over two years, third in total defense (315.1 yards per game) and pass defense (200.4 ypg), and helped the Eagles reach Super Bowl LVII.[1][2][4] At age 40, Gannon became head coach of the Arizona Cardinals in February 2023, succeeding Kliff Kingsbury.[1][2][3] He secured his first regular-season win against the Dallas Cowboys (28-16) but compiled a 15-36 record over three seasons (2023-2025), with no playoff appearances.[1][3] Gannon was fired by the Cardinals on January 5, 2026.[3] Now 43, Gannon joined the Packers as defensive coordinator shortly after his Cardinals dismissal, bringing his experience building elite defenses and energetic leadership style.[1][7] His coaching tree includes mentors like Mike Zimmer, Bobby Petrino, and Nick Sirianni, and he has worked with teams that made six playoff berths in eight seasons across the Eagles, Colts, and Vikings.[2][3] Gannon emphasizes versatility, player development, and in-game adaptability.[2][6]