Master Choi grew up in Korea and has been training since the age of 5. He has over 30 years teaching experience and is known in Korea, France, and the USA for his achievements as head instructor at the US military base in South Korea as well as his service in founding the French Soo Bahk Do Moo Duk Kwan Federation where he was head instructor and technical advisor for ten years. He has trained under Grandmaster Hwang Kee (the founder of the Moo Duk Kwan) as well as the current Grandmaster H.C. Hwang. He moved to the United States in 1999 where he opened the Korean Martial Arts Academy in New Milford, CT. In July of 2007 he opened his second location, Handol, in Danbury, CT.

Master Tsai is currently a 5th degree midnight blue belt with the Moo Duk Kwan and has trained in the Martial Arts for over 19 years. Prior to attaining his masters belt, he was the United States Soo Bahk Do National lightweight sparring champion for 4 years in a row and won 1st place in the full contact continuous sparring division at the Battle of Baltimore. Some of the many styles Master Tsai previously studied included Japanese Karate, Caeporia, Jiu-Jitsu, Tai-Chi, Wing Chun, and wrestling. He also regularly practices Astanga Yoga and enjoys break dancing in his free time. Master Tsai also holds a Bachelor's of Science in Computer Engineering and a Masters Degree in Information Systems from the Johns Hopkins University. He telecommutes full time for RightNow Technologies as an Application Engineer developing web applications.