The Los Angeles Chargers announced today that they have agreed to terms with Chris O’Leary to become the team’s defensive coordinator. O’Leary returns to the Chargers organization after serving as the team’s safeties coach in 2024 under head coach Jim Harbaugh and most recently working as defensive coordinator at Western Michigan in 2025. His Western Michigan unit helped the Broncos reach a 10-4 record and capture the Mid-American Conference Championship, while he brings a track record of turning around defenses at both the collegiate and professional levels. The move signals the Chargers’ intent to build on a top-ranked 2024 defensive season and to pair NFL experience with successful college coordinator work.
Key Takeaways
- Chris O’Leary agreed to terms with the Los Angeles Chargers as defensive coordinator on the team’s announcement date (2026).
- O’Leary was the Chargers’ safeties coach in 2024 under Jim Harbaugh and rejoined the Bolts after serving as Western Michigan’s DC in 2025.
- Western Michigan finished 10-4 in 2025 and won the MAC Championship — the program’s fourth conference title.
- Under O’Leary, Western Michigan ranked No. 9 in FBS scoring defense, allowing 17.4 points per game, and ranked second in the MAC in scoring defense.
- In 2024 the Chargers led the NFL in scoring defense (17.7 points per game) and allowed touchdowns on 45.0% of red zone drives, the league’s best red zone defense.
- O’Leary coached Derwin James Jr. in 2024, who earned a Pro Bowl nod and AP second-team All-Pro honors after recording 70 tackles, five sacks, one interception and five passes defensed.
- O’Leary’s college résumé includes top-10 national defensive finishes at Notre Dame (2023) and recognized player development (e.g., Xavier Watts’ seven interceptions and Bronko Nagurski Trophy recognition).
Background
The Chargers entered the 2024–2025 period with a defensive identity that ranked at the top of the NFL in several key categories. Jim Harbaugh’s staff emphasized aggressive, versatile front-seven play and interchangeable defensive back personnel, with safeties playing a central role. O’Leary’s prior stint with the Chargers as safeties coach positioned him as a known quantity within that schematic framework.
At the collegiate level, O’Leary’s recent success—most notably at Western Michigan in 2025 and at Notre Dame in 2023—has been defined by measurable defensive improvements. Western Michigan’s turnaround to a 10-4 season and a MAC title followed a staff rebuild that emphasized gap integrity, third-down defense and limiting opponent scoring. Notre Dame’s 2023 defense under O’Leary’s guidance finished top-10 nationally in multiple categories, reinforcing his reputation for scheme teaching and player development.
Main Event
The Chargers’ official announcement confirms O’Leary will assume the defensive coordinator role and rejoin Jim Harbaugh’s staff. The team framed the hire as a return of a coach familiar with organizational culture and with recent coordinator experience at the college level. The timing follows O’Leary’s 2025 season in Kalamazoo, where he led a MAC title run.
O’Leary’s Western Michigan defense allowed 17.4 points per game in 2025, ranking ninth nationally in scoring defense and 19th in total net yards allowed per game (305.5). Those metrics were central in the Chargers’ public explanation for hiring a coordinator with a demonstrated ability to limit opponent scoring and yardage.
During his 2024 season with the Chargers as safeties coach, O’Leary worked closely with All-Pro safety Derwin James Jr., who posted 70 tackles, five sacks, one interception and five passes defensed and earned Pro Bowl and AP second-team All-Pro recognition. Team statements highlighted O’Leary’s role in player development and situational preparation, particularly in red zone and third-down situations.
The hire also adds to a résumé that includes graduate-assistant and position-coach stops at Notre Dame (2020–2023), Georgia State (2015–16) and Florida Tech (2017), and a collegiate playing career at Indiana State (2010–14). The Chargers noted his familiarity with both pro concepts and modern collegiate defensive trends as a reason for the appointment.
Analysis & Implications
Short term, O’Leary’s arrival is likely to preserve continuity while introducing fresh coordinator-level game-planning and play-calling ideas. The Chargers’ 2024 defense excelled in scoring defense and red-zone efficiency; O’Leary’s recent college results suggest he prioritizes empirical measures such as points allowed, third-down stops and turnover creation. Translating those college strengths to the NFL will depend on staff responsibilities and whether he will call plays or collaborate with existing defensive staff.
From a personnel-development perspective, O’Leary has a documented track record of improving defensive backs and safeties, as seen with Xavier Watts at Notre Dame and Derwin James Jr. in Los Angeles. That bodes well for maximizing the Chargers’ secondary talent and for integrating hybrid safety/box-safety concepts that fit today’s pass-heavy offenses.
Strategically, the hire signals the Chargers’ emphasis on limiting opponent scoring and strengthening situational defense (red zone, late-down efficiency). If O’Leary replicates his college-level gains—particularly in points and yards allowed—the Chargers could sustain or improve their defensive ranking in the AFC, which in turn affects game-management decisions, roster allocation and offseason priorities.
There are risks: college-to-pro transitions are not always linear. Success at the collegiate level can depend on scheme fit against younger, less experienced opponents; the NFL presents more specialized skill sets and higher-level schematic countermeasures. The staff will need to adapt concepts without overcomplicating in-game play-calling.
Comparison & Data
| Team / Season | Scoring Defense (PPG) | National/League Rank | Total Yards Allowed (YPG) |
|---|---|---|---|
| Western Michigan / 2025 | 17.4 | No. 9 FBS; 2nd MAC | 305.5 (No. 19 nat.) |
| Los Angeles Chargers / 2024 | 17.7 | Led NFL | — |
The table highlights the comparable points-allowed profiles that underpin the hire: O’Leary’s Western Michigan unit and the Chargers’ 2024 defense both allowed fewer than 18 points per game. Western Michigan’s 305.5 yards-per-game figure placed it among the national leaders in limiting total offense, reinforcing O’Leary’s capacity to manage both scoring and yardage metrics.
Reactions & Quotes
“Bolt Up!”
Los Angeles Chargers (team slogan)
“O’Leary’s recent run of defensive results at the collegiate level and his prior work with our defensive backs made him an attractive candidate to lead our defense.”
Chargers announcement (official statement)
“His track record developing versatile safeties and improving scoring defense will be closely watched as he transitions to a coordinator role in the NFL.”
NFL analyst (paraphrase)
Unconfirmed
- The exact contract length and financial terms for O’Leary’s agreement with the Chargers were not disclosed in the team announcement.
- It is not yet confirmed whether O’Leary will be the primary play-caller for the defense or will share play-calling duties with other staff members.
- Any additional staff changes or positional coach hires associated with O’Leary’s arrival have not been announced.
Bottom Line
The Chargers’ hire of Chris O’Leary blends internal familiarity with recent coordinator success at the college level. O’Leary’s background—coaching in the NFL as a position coach in 2024 and leading a MAC championship defense in 2025—offers both continuity and a fresh strategic voice for Los Angeles’ defense.
Short-term expectations should be realistic: the team inherits a coach skilled in player development and situational defense, but the staff must bridge college-to-pro differences in scheme and opponent quality. For fans and roster planners, the most immediate signals will come in the offseason about play-calling responsibilities, staff structure and how O’Leary’s concepts are implemented during preseason and beyond.
Sources
- Chargers.com — Official team announcement