In 1962 he began training in Tang Soo Do under Grandmaster Jae C. Shin and on May 12, 1963, Grandmaster Beaudoin tested for his black belt in Inchon, Korea in front of Grandmaster Hwang Kee and Grandmaster Shin.
After completing his military service, he returned to Connecticut and opened the Beaudoin Academy of Karate in 1965. In July 1971, Grandmaster Shin promoted Grandmaster Beaudoin to the rank of Master in a special presentation by removing his own Master’s belt and tying it on Grandmaster Beaudoin. During the succeeding years his studio grew, and through his efforts and those of his students Tang Soo Do spread throughout the New England region.
Grandmaster Beaudoin was promoted to the rank of 8th Dan at the 2010 World Championships at the same event where Grandmaster Shin was promoted to 9th Dan. Upon the passing of Grandmaster Shinin 2012, he took over as the Grandmaster of World Tang Soo Do and under his leadership World Tang Soo Do has continued to grow.