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Guerrieri, Haines, and More: Five Candidates for Defensive Coordinator at Ohio State

With Jim Knowles gone, Ohio State is eyeing these five candidates to lead its defense.

Avatar photoMike Huesmann| January 27, 2025 (Updated: July 24, 2025)
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By: Mike Huesmann


Fresh off a national title, the Buckeyes will be looking for a new defensive coordinator. Jim Knowles has left for conference rival Penn State and Ryan Day has his first hurdle of the offseason to deal with. Knowles spent three successful years at OSU after coming over from Mike Gundy’s staff at Oklahoma State. Here are five coaches who could replace him.

Welcome to Happy Valley, Jim Knowles #WeAre pic.twitter.com/WR3YsFJY8Q

— PS Football U (@psufootballu) January 26, 2025


Matt Guerrieri

Ohio State, Safeties Coach

Guerrieri just finished his first season with Ohio State as safeties coach. Prior to 2024 he spent a season at Indiana as co-defensive coordinator and safeties coach, a year with Ryan Day as an analyst in 2022, and before that nearly a decade with David Cutcliffe at Duke working his way up from graduate assistant to co-defensive coordinator. He’s the consistency candidate who’s probably earned this promotion if Day doesn’t want to rock the boat.

Ohio State's safeties coach, Matt Guerrieri, is the most likely option to become the new defensive coordinator at Ohio State.

– His wife's family is from Ohio.
– He was with Knowles at Duke when Knowles built his defense under Cutcliffe.
– Ryan Day called him a 'rising star' at… pic.twitter.com/YV1sFcP97a

— The Big Ten Huddle 🎙️ (@TheBigTenHuddle) January 26, 2025

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Jonathan Patke

Duke, Defensive Coordinator

Patke was brought in to Duke from Texas State and he and Manny Diaz immediately had a tough defense that was blitz heavy and left DB’s on an island. He has a lot to offer, coached in Florida and Texas, two hotbeds for recruiting. The longtime Miami assistant was defensive coordinator at Texas State in 2023, he had followed Kinne from Incarnate Word. His aggressive style defense, success in Florida, and intangibles make him a guy to look at here.

Duke defensive coordinator Jonathan Patke named a Broyles Award nominee https://t.co/d9IUU977yy pic.twitter.com/iwZf1C3Ubj

— Duke Wire (@DukeWire) November 27, 2024


Bryant Haines

Indiana, Defensive Coordinator

Haines followed Cignetti from James Madison and those guys haven’t put a foot wrong in a long time. He coached elite defenses at JMU, being a Broyles Award semifinalist in 2023 for the nation’s top assistant coach. The Hoosiers had a magical season and playoff appearance. Haines, a Ball State alumnus, knows the Midwest well and has been an elite defensive coordinator for multiple years.

Indiana has finalized a new contract with defensive coordinator Bryant Haines, sources tell @CBSSports/@247Sports.

Haines, a Broyles Award finalist, led the way as Indiana ranked No. 2 nationally in total defense this year and was key in IU’s run to 11 wins and a Playoff berth.… pic.twitter.com/nAjKiYLMtv

— Matt Zenitz (@mzenitz) January 26, 2025


Jon Heacock

Iowa State, Defensive Coordinator

Heacock is a veteran of college football and fits the profile for this job. He coached under Jim Tressel at Youngstown State before succeeding him as head coach. He has had Big Ten stops at Michigan, Indiana, and Purdue. He has been Matt Campbell’s top lieutenant since 2014 and their Toledo days. Would he leave that long relationship for a better shot at a title and bigger payday?

Jon Heacock is not happy pic.twitter.com/Z0p0pYTv9L

— Derek Duke (@DerekDuke25) September 9, 2023


John Hauser

Ohio, Defensive Coordinator

Hauser led a top ten defense for the Bobcats in 2024 and was elite in the MAC. A Columbus native he has coached at Miami (OH) and Ohio since 2014, giving him plenty of familiarity with recruiting in the state. I think Day goes with someone who has more P4 experience but if Ohio roots and success as a defensive play caller are his driving factors, then Hauser could make sense. 

John Hauser Promoted to Associate Head Coachhttps://t.co/PL8xPFHVBU

— Ohio Football (@OhioFootball) December 20, 2024

Category: College Football, NewsTag: Broyles Award, Bryant Haines, Duke Blue Devils, Indiana Hoosiers, Iowa State Cyclones, James Madison, Jim Knowles, John Hauser, Jon Heacock, Jonathan Patke, MAC, Manny Diaz, Matt Campbell, Matt Guerrieri, Ohio Bobcats, Ohio State Buckeyes, Texas State Bobcats, Toledo Rockets
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