Quinn then served six seasons as the head coach of the Atlanta Falcons from 2015 to 2020, with the team appearing in Super Bowl LI in 2016.

He was hired as defensive coordinator of the Dallas Cowboys in 2021, with his unit leading the league in takeaways for three consecutive seasons.

Quinn was named head coach of the Commanders in 2024, leading them to an appearance in the NFC Championship Game in his first year.

[2][3][4] Quinn attended Salisbury University, an NCAA Division III school, and played defensive lineman on its football team from 1989 to 1993.

[6] Quinn began his coaching career with the William & Mary Tribe football team in 1994 and at Virginia Military Institute in 1995, working with their defensive lines.

[8] He was promoted to defensive line coach in 2003, later working the same role for the Miami Dolphins (2005–2006), New York Jets (2007–2008), and Seattle Seahawks (2009–2010).

Carroll and Quinn were credited with developing the Seattle Cover 3 defense, which was led by a strong secondary known as the Legion of Boom.

[20] In the Divisional Round, the Falcons lost on the road to the eventual Super Bowl champion Philadelphia Eagles by a score of 15–10.

[27] Quinn stepped in as acting head coach in a game against the New Orleans Saints after McCarthy had tested positive for COVID-19.

[36] The Commanders finished the 2024 season with a record of 12–5, their highest win total since 1991 and most by a head coach in his first year with the team.

[37] In the 2024–25 NFL playoffs, the team defeated the Tampa Bay Buccaneers and Detroit Lions before losing to the Philadelphia Eagles in the NFC Championship Game.