Sean Kirwan joined the Dartmouth men's lacrosse program in June of 2023.
Kirwan spent the last seven seasons as the offensive coordinator at Virginia, where he helped lead the Cavaliers to national championships in 2019 and 2021, along with three Final Four appearances and a pair of ACC titles. Under Kirwan, the Virginia offense ranked among the top three nationally in goals per game in four different seasons. The 2023 Cavalier attack, which was instrumental in the team's run to the national semifinal, finished as the country's top scoring offense with 17.24 goals per game and set a new program record for total goals in a season (293). Kirwan was named the 2021 IMLCA Assistant Coach of the Year after helping guide Virginia to consecutive national titles.
A 2012 Tufts University graduate, Kirwan coached 18 All-Americans during his tenure at Virginia, including recent two-time Tewaaraton Award finalist and three-time first teamer Connor Shellenberger. Another three-time All-American, Matt Moore, broke the program's single-season and career points records under Kirwan's tutelage after transitioning from midfield to attack. Additionally, Kirwan developed consecutive ACC Rookie of the Year honorees in Michael Kraus (2017) and Moore (2018).
 
Prior to his seven-year stint at Virginia, Kirwan spent two seasons running the Brown offense with two Ivy League titles and a Final Four appearance to his credit. During the 2015 season, his first on the Bears' staff, Kirwan helped Brown win 12 games, its highest total since 2009, to set the stage for a program-best 16 victories the following season. His offense was especially potent in 2016 with a nation-leading 16.32 goals per game. Dylan Molloy was honored with the Tewaaraton Award as the top male collegiate lacrosse player in 2016, having led the country with 116 points, and becoming the first in program history to earn the prestigious accolade. Molloy was also named the Ivy League Player of the Year in both 2015 and 2016.
 
Kirwan coached under Lars Tiffany, a two-time ACC Coach of the Year recipient, at both Brown and Virginia. Tiffany earned back-to-back Ivy League Coach of the Year honors in 2015 and 2016 — both seasons with Kirwan on the staff.
 
Kirwan played collegiately and began his coaching career at Division III Tufts, where he helped the Jumbos win their first-ever national championship as part of his record-setting playing career that featured 150 goals — the program's top mark at the time. He joined the coaching staff following his 2012 graduation and spent two seasons leading the team's offense before entering the Division I coaching ranks prior to the 2015 season.
The Jumbos won the 2014 national championship with Kirwan serving as the offensive coordinator to complement back-to-back conference titles. The 2014 team amassed 423 goals, which stood as the highest single-season total by any team in history across all NCAA divisions at the time.
 
Kirwan gained additional coaching experience at the professional level, spending multiple seasons implementing offensive schemes for the Boston Cannons and the Cannons Lacrosse Club. In 2021, Kirwan's offense ranked as the second most efficient attack in Premiere Lacrosse League history. Additionally, he assisted with draft strategy and roster management.
A native of Boonton Township, New Jersey, Kirwan earned a bachelor's degree in child development and was a two-time All-American (2011 and 2012), plus a 2012 Academic All-American, at Tufts.