Bills Hire DL Coach Terrance Jamison

Like new Bills defensive coordinator Jim Leonhard, Jamison played college football at Wisconsin. Their careers with the Badgers didn’t overlap, but they were on the Illinois coaching staff together in 2023. Leonhard left after one season to join the Broncos’ staff.

An assistant at a handful of colleges since 2008, Jamison coached Bengals star pass rusher and soon-to-be free agent Trey Hendrickson at Florida Atlantic from 2014-16.

More recently, Jamison spent the past half-decade at Illinois. The 38-year-old helped develop defensive tackle Jer’Zhan Newton, now with the Commanders, into a 2024 second-round pick. Jamison also assisted with edge rusher Gabe Jacas‘ 11-sack effort in 2025. After earning first-team All-Big Ten honors, Jacas could come off the board sometime in the first few rounds of April’s draft.

Now heading to Buffalo for his first job in the pros, Jamison will work on a staff that will likely implement a 3-4 base defense in 2026. The Bills ran a four-man front under former head coach Sean McDermott and ex-defensive coordinator Bobby Babich.

Jamison stands to inherit linemen Greg Rousseau, Ed Oliver, Deone Walker and T.J. Sanders, though it’s not yet clear if Leonhard regards all of those players as fits for his scheme. Meanwhile, after combining for upward of 1,400 snaps in 2025, Joey Bosa, A.J. Epenesa and DaQuan Jones are scheduled to reach the open market in March. It wouldn’t be a surprise to see all three walk in free agency.

Elsewhere on the Bills’ staff, rookie head coach Joe Brady will retain several of McDermott’s former assistants, per Joe Buscaglia of The Athletic. Kelly Skipper (running backs), Rob Boras (tight ends), Austin Gund (assistant offensive line), DJ Mangas (quality control/assistant wide receivers coach), Mark Lubick (passing game specialist/game management) and Kyle Shurmur (offensive quality control) will return in 2026. Brady, the Bills’ offensive coordinator before they promoted him to replace McDermott, is already familiar with all of those coaches.