Ready for Every Opportunity 

Sean Duggan never planned on becoming a football coach, but one conversation changed everything and launched a journey to the Miami Dolphins.
 

Sean Duggan '11 never envisioned himself coaching in the National Football League. 

In fact, as his playing career at Boston College came to an end in 2014, he thought football itself might be over. 

One conversation changed everything. 

Twelve years later, the former St. Xavier linebacker enters the 2026 season as defensive coordinator of the Miami Dolphins, completing one of the fastest coaching ascents in professional football. 

"I always wanted to find the best place for me, and I always thought that wherever you are, just work as hard as you can and people will respect you," Duggan said. 

That mindset began taking shape long before he reached the NFL. 

At St. Xavier, Duggan was the definition of versatility. A three-sport athlete in football, basketball, and lacrosse, he became one of the Bombers' most dependable players by embracing whatever role the team needed. Whether lining up at linebacker, tight end, or kicker, he never hesitated to contribute. During his junior and senior seasons, he connected on 10-of-14 field goals, converted 25 extra points, and recorded 101 tackles, three sacks, one forced fumble, three fumble recoveries, and four interceptions. 

"However the coach felt was the best place for me to play, any opportunity on the field was a good one," Duggan said. "For me, coaching defense is about knowing how you're getting attacked. When you can tell your guys what an offense is trying to do before the play unfolds, they can play faster. Playing multiple positions growing up and learning how each side is trying to attack or defend something has been huge for me." 

Before Boston College molded him into an ACC linebacker, Duggan says St. Xavier had already instilled many of the values that continue to shape his coaching philosophy. 

"What I really appreciate about my time at St. X was that you had to be a full-time student, and there was a strong emphasis on serving the community and giving back," Duggan said. "The other thing I appreciate about St. X is that there were so many different types of people there. You got to meet new people and learn from them every day—in the classroom, on the field, and on the court." 

A three-year starter for the Eagles, Duggan totaled 115 tackles, 6.5 tackles for loss, two interceptions, two pass breakups, and one forced fumble in 33 games. Playing linebacker taught him to understand the game from every angle and become the communicator of the defense. 

"The best part about playing linebacker is that you get to know what's going on everywhere around you," Duggan said. "You have to know what the guys behind you are responsible for, and obviously you have to know what the guys in front of you are doing so you can make things right. You have the ability to adapt and fix problems." 

As graduation approached, Duggan wasn't planning on becoming a coach. That changed when Boston College defensive coordinator Don Brown convinced him to stay for one more spring. 

"For me, I didn't really want to coach," Duggan said. "It was my position coach and defensive coordinator, Don Brown, who was awesome to play for. He said, 'Why don't you come help out in the spring?' I thought maybe I'd do it for a year, get a little more school paid for, and see if I liked it. I fell in love with coaching, and after a year I knew this was definitely what I wanted to do." 

His first coaching experience came almost immediately after his playing career ended, working with many of the same teammates he had shared a locker room with only months earlier. 

"It was a little different my first year because I had played with those guys just a few months earlier," Duggan said. "When I played with them, they already respected me as someone who knew what was going on. Then I went to Hawaii, where I was 21 years old coaching a linebacker who was 23. You really have to know the details of what you're teaching. Once players know you care about them and can make them better, that's when coaching becomes easy." 

That foundation followed Duggan through each stop of his coaching career. 

After one season at Boston College, he joined the University of Hawaii, where he helped develop future NFL draft pick Jahlani Tavai into one of the Mountain West's top linebackers. He then moved to Massachusetts, where Bryton Barr finished among the nation's leaders in tackles while earning ECAC Defensive Player of the Year honors. 

His final stop as a graduate assistant came at Ohio State, where he helped coach one of the nation's premier defenses. While working with vastly different personnel at Hawaii, UMass, and Ohio State, Duggan learned one of the defining principles of his coaching philosophy. 

"The biggest thing is that you have to fit the scheme around who you have," Duggan said. "A lot of coaches say, 'This is what we do,' but they forget it's really about the players. You'll always have your core beliefs in coverage, fronts, and pressure packages, but you have to adapt to the players you have. At UMass, we didn't have a guy like Chase Young coming off the edge, so we had to be creative. At Ohio State, we had freaks everywhere." 

That philosophy paid dividends when Duggan returned to Boston College in 2020 as linebackers coach before earning a promotion to co-defensive coordinator in 2023. During his tenure, the Eagles transformed from one of the nation's lowest-ranked defenses into one of the country's top 30 units. 

Yet Duggan says the most rewarding part of coaching has little to do with wins and losses. 

"An unexpected lesson for me has been how rewarding it is when your players succeed," Duggan said. "Seeing a guy have success, whether in college or the NFL, is the best feeling. At the end of the day, it's a business, so it's always going to be results-driven." 

That player-centered approach opened the door to the NFL. 

When Jeff Hafley joined the Green Bay Packers, Duggan followed as assistant linebackers coach before taking over the position room in 2025. Coaching professionals required a different approach—not teaching the fundamentals of football, but helping elite athletes maximize their abilities while continuing to build trust. 

"I try to get to know each guy and treat him like a blank slate," Duggan said. "The cool part about coaching a guy like Micah Parsons is that he's one of the smartest players I've ever been around. You get to pick his brain all the time, and he was a huge part of what we did, not just schematically. You have to know your players and show them what the right decisions are. Fortunately, everywhere I've been in the NFL, we've had veteran players with great character both on and off the field. Those are the guys you can point younger players toward." 

Now Duggan has reached another milestone. 

When Hafley was named head coach of the Miami Dolphins, one of his first calls was to Duggan, giving the former Bomber his first opportunity to coordinate an NFL defense. 

"I was really excited to work with Coach Hafley," Duggan said. "I've been with him for a while now, so I know the kind of organization he wants to build, and it fits me. The thing I'm most excited about is seeing our brand of football come to life. Our biggest emphasis is that we're going to play physical football with unbelievable effort." 

From St. Xavier to Boston College, Hawaii, Massachusetts, Ohio State, Green Bay, and now Miami, Duggan's journey has been shaped by the same principles that first took root as a Bomber—embracing versatility, adapting to the people around him, and earning the trust of those he leads. Those lessons continue to guide one of the NFL's youngest defensive coordinators as he prepares to lead his own defense on Sundays.