Choi's Tae Kwon Do has a long history and tradition. In 1968 Grand Master Dan Choi, along with several other instructors, came to California from Korea to introduce the then unknown martial art of Tae Kwon Do to the United States. Master Dan Choi became one of the first people to teach Tae Kwon Do in the Bay Area. In 1971 Grand Master Dan Choi opened Santa Clara Valley's first Tae Kwon Do studio, Choi's Institute of Tae Kwon Do. Over the years, Choi's Tae Kwon Do has produced many excellent Black Belts, some of whom have become national and World Cup Champions. Instructors at many Tae Kwon Do or martial arts schools in the Bay Area got their start under Grand Master Dan Choi or Grand Master Hyun Choi (Grand Master Dan Choi's younger brother). For example, Ernie Reyes (Senior) and Tony Thompson, who were among Grand Master Dan Choi's first black belts, went on to found West Coast Karate.

Many of Grand Master Choi's students have gone on to open their own Choi's affiliated schools under Grand Master Choi's guidance. In 1998 Grand Master Hyun Choi founded the United Tae Kwon Do Association to unify all of the Choi's affiliated studios. Currently the UTA has twelve schools throughout United States and one affiliate school in Seoul, Korea. Currently the UTA has over 250 World Tae Kwon Do Federation (WTF) accredited black belts. The current United Tae Kwon Do Association's membership includes National and International Tournament Champions, 22 USTU certified Referees, and 8 International Referees (qualified to referee in International Tournaments such as the Olympics).

Master Leonard Ortez, Director and founder of  LEEJON Tae Kwon Do in Blossom Valley, is one of the many highest-ranking black belts under Grand Master Hyun K. Choi. Master Leonard Ortez is 7th Degree black belt with 30 years of teaching experience. Over the past two decades, Master Ortez has received much recognition nationally and internationally for his efforts in promoting and developing Tae Kwon Do as a world sport, and for his dedication to preserving the traditional teachings of Tae Kwon Do.