He is the founder and head coach of the Massialas Foundation (MTEAM), a fencing club in San Francisco. Since 2012 he is the national coach of the United States senior foil team, which includes his own son Alexander. He brought the club to a No.1 world ranking, with each of its four members ranking individually in the Top 10 and Miles Chamley-Watson winning the 2013 World Fencing Championships. Massialas' daughter Sabrina, now a senior, is also a high-level foil fencer.