Coach Duffy been teaching and coaching at Norfolk Academy for 18 years (after five years at nearby Nansemond-Suffolk Academy).
- Co-captain of the 1984 U.S. Naval Academy’s lacrosse team
Received Navy's 1984 VADM E.C. Waller Lacrosse Award
- Played in the 1984 North-South College All-Star game
- Three-time TCIS Coach of the Year in Boys' Lacrosse and once in Girls' Basketball
- Two-time VISAA State Assistant Coach of the Year
- Recipient of Norfolk Academy's "Excellence in Coaching" Award 2010
- Recipient of Norfolk Academy's Middle School Teacher of the Year Award, Charter Day Award, and Waitzer Master Teacher Award
- Keynote speaker at 2009 US Lacrosse Youth Council Awards Breakfast
- Author, The Spirit in the Stick
In the last twenty-two years, Coach Duffy’s players have earned no less than:
- 15 Scholastic All-America/Academic All-America Awards
- 12 Collegiate All-America Awards in Lacrosse (and several in other sports)
- 8 National Collegiate Championships (with at least three as coaches)
- a World Championship
- a Junior World Championship
- a National Collegiate Coach of the Year award
- a National Collegiate Player of the Year award
- Several Collegiate All-Conference and Conference Player-of-the-Year awards, and have
- Captained no less than Eighteen Collegiate teams
- Played in at least Three North-South College All-Star games
- Been named Professional Lacrosse (MLL and NLL) All-Stars at least four times, while
- 35 Players have been Four-Year (or current) Collegiate Letter Winners, and
- Many of his players are current collegiate, high school, middle school, and youth league coaches and officials.