Buffalo Bills Hire Jim Leonhard as New Defensive Coordinator

Former Bills player and Broncos assistant coach tasked with leading Buffalo's defense to Super Bowl glory

Apr. 10, 2026 at 3:56am

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A fractured, geometric painting depicting a football game or match, with sharp, overlapping planes of color and shape representing the strategic battle between the Buffalo Bills and Denver Broncos.A cubist interpretation of the strategic chess match between the Bills and Broncos, with new defensive coordinator Jim Leonhard tasked with outmaneuvering his former team.Buffalo Today

The Buffalo Bills have hired Jim Leonhard, the Denver Broncos' assistant head coach and defensive pass game coordinator, as their new defensive coordinator. Leonhard, a former Bills player, is a rising star in coaching circles and will team up with new offensive coordinator Pete Carmichael Jr. to reshape the team's strategy under rookie head coach Joe Brady.

Why it matters

Leonhard's hiring is a controversial move, as he played a key role in the Broncos' 2025 AFC Championship run that included an overtime Divisional Round win over the Bills. Now he's tasked with fixing the very defense he once outsmarted. This high-profile hire will be closely watched as the Bills aim to take the next step and reach the Super Bowl.

The details

At 43, Leonhard is a defensive mastermind who has quickly climbed the coaching ranks after a 10-year NFL career as a defensive back, including four seasons with the Bills. His experience as Wisconsin's defensive coordinator from 2017 to 2022, including a stint as interim head coach, gives him a unique blend of tactical acumen and leadership. Leonhard helped develop 2024 AP NFL Defensive Player of the Year Patrick Surtain II and led the Broncos to the league's No. 2 total defense in 2025.

  • Leonhard joins the Bills' coaching staff in April 2026, ahead of the 2026 NFL season.
  • He previously played for the Bills from 2005 to 2008.

The players

Jim Leonhard

The new defensive coordinator for the Buffalo Bills, who previously served as the assistant head coach and defensive pass game coordinator for the Denver Broncos.

Joe Brady

The rookie head coach of the Buffalo Bills, who is making bold moves to reshape the team's coaching staff.

Pete Carmichael Jr.

The newly hired offensive coordinator for the Buffalo Bills, who will team up with Leonhard to reshape the team's strategy.

Sean McDermott

The former head coach of the Buffalo Bills, who often called defensive plays.

Bobby Babich

The former defensive coordinator of the Buffalo Bills, whose role Leonhard is now filling.

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What they’re saying

“Hold onto your helmets, Bills Mafia, because Buffalo's coaching staff is getting a major upgrade—and it's not just about X's and O's.”

— Ian Rapoport, NFL Network Insider

“Now, he's tasked with turning the tables and leading the Bills to Super Bowl glory. Talk about a full-circle moment!”

— Ian Rapoport, NFL Network Insider

What’s next

The Bills will closely monitor Leonhard's progress as he works to reshape the team's defense and lead them to the Super Bowl. His past with the Broncos will be a key storyline to follow as the 2026 season unfolds.

The takeaway

Leonhard's hiring as the Bills' new defensive coordinator is a high-profile and controversial move, as he previously played a key role in the Broncos' playoff victory over Buffalo. However, his proven track record of defensive success and leadership make him a promising addition to the Bills' coaching staff as they aim to take the next step and reach the Super Bowl.