Tim Flynn has been the head boys varsity lacrosse coach at Mountain Lakes High School since 1979. Over the last 36 years, he has achieved over 600 wins, making him the winningest coach in NJ High School history. He has served as a physical education instructor since 1979 and took the helm as department head in 1999. Flynn is past president of the New Jersey Lacrosse Coaches Association and a past trustee of the New Jersey chapter of US Lacrosse.
Flynn's resume also lists extensive awards for his coaching excellence, including New Jersey Coach of the Year bestowed by both the New Jersey Star Ledger (1987, 1989) and the New Jersey Coaches Association (1988, 1993) and he was the recipient of the Len Roland Sportsmanship Award (1990) and the Garden State Games Distinguished Service Award (1997). He is a member of the New Jersey chapter of US Lacrosse Hall of Fame (inducted 1998), the NJSIAA Hall of Fame (inducted 1995) and the Montclair State College Lacrosse Hall of Fame (inducted 2009).
In 2012, Flynn was selected to be Head Coach of the US U-19 Team, and helped guide the team to a Gold Medal Championship at the U -19 World Championships in Finland. Flynn had previously served as an Assistant Coach on the US U -19 Team in the 2008 World Championships. He serves on the Board of Laker Lacrosse.