During his collegiate career, Dwan was named an All- American three times, helping the Greyhounds advance to the NCAA tournament each of his four seasons at Evergreen. His senior year in 1995, Dwan recorded 11 goals, five assists and 93 ground balls, earning first-team All-America honors. At the time, he was just the second long-stick midfielder in NCAA history to accomplish that feat. In 1994, he was selected as a second-team All-American and was named honorable mention as a sophomore. Dwan was named co-captain and team co-MVP his final two seasons at Loyola, and in May 1995 he graduated with career totals of 19 goals, eight assists and 240 ground balls.
A former Greyhounds' lacrosse standout himself, Dwan played professionally for the Baltimore Bayhawks of Major League Lacrosse. Part of the inaugural MLL season in 2001, Dwan played in every game for the Bayhawks from 2001 to 2003. He helped anchor a defense that advanced to the MLL championship game in each of his three seasons, while capturing the championship in 2002.
Dwan is currently an assistant coach with the Loyola men's lacrosse program as the Greyhounds' defensive coordinator, Dwan has helped the Greyhounds become one of the most formidable defenses in the nation.