After starting his NFL playing career in Buffalo in 2005, Jim Leonhard is headed back to western New York. The Bills are expected to hire the 43-year-old as their defensive coordinator, per NFL Network’s Ian Rapoport.
Leonhard spent the last two seasons in Denver as their defensive pass game coordinator. He additionally held the title of defensive backs coach in 2024 and assistant head coach in 2025. In that time, the Broncos defense has been one of the best in the NFL, ranking second in yards per attempt last year and leading the league this past season. He is the team’s second assistant to join Joe Brady‘s new staff in Buffalo; Broncos senior offensive assistant Pete Carmichael accepted a job as the Bills’ new offensive coordinator earlier this week.
Leonard has now completed a remarkable rise from walk-on safety at the University of Wisconsin to NFL defensive coordinator. Despite three straight All-Big Ten nods to end his college career – and a strong pedigree as a returner – Leonhard went undrafted in 2005. He signed with the Bills and made the 53-man roster, kicking off a decade-long career that featured stints with five other teams.
Among them were the Broncos, who gave Leonhard his first NFL coaching job, and the Ravens, who requested to interview him for their defensive coordinator vacancy. He also interviewed with the Cowboys, Chargers, and Jets, but they all went with other candidates. Instead, he will join Brady in Buffalo as the play-caller for a Bills defense that was one of the league’s best from 2021 to 2023 but faltered in the last two years.
The Bills’ coaching jobs were viewed as some of the most desirable in the league due to the franchise’s recent success and the presence of star quarterback Josh Allen. But a closer look at the roster reveals significant holes. The defensive line features only two proven impact players in Greg Rousseau and Ed Oliver, veteran linebackers Matt Milano and Joey Bosa are set to hit free agency, and the secondary either needs more veteran depth or some development from their younger players.
Leonhard can certainly address that final issue right away. A number of Broncos defensive backs have taken significant steps forward under Leonhard, including cornerbacks Riley Moss and Ja’Quan McMillian. Safety Talanoa Hufanga earned a second-team All-Pro nod in 2025, his first year in Denver, and Patrick Surtain won Defensive Player of the Year in 2024.
Leonhard starting his coaching career at his alma mater in 2016. After a year as defensive backs coach, he was promoted to defensive coordinator and eventually served as the interim head coach in 2022. He then spent a year at Illinois as an analyst before joining Sean Payton‘s staff in Denver.
I’m excited about this move, admired him as a player and have heard good things about his coaching style
If he can infuse the aggressive mentally into this group and limit teams to an average of 14-21 points then it puts the Bills in a much better position
Great hire. GO BILLS!
I like this for buffalo
I like Jim Leonhard and wouldn’t be surprised at all if he’s a good DC, but it’s bizarre just how obsessed some people seem to have been with the idea.