Yeon Hee Park was the undefeated Korean champion of Tae Kwon Do from 1962 to 1967. He served as vice president of the National Tae Kwon Do Union of the United States and is currently the world Tae Kwon Do Kukkiwon Adviser. He lives in Demarest, New Jersey.
Yeon Hwan Park is the president of the United States Tae Kwon Do Union and publisher of USA Tae Kwon Do Review. His previous books include Tae Kwon Do: My Life and Philosophy and Tae Kwon Do for Children. He lives in East Meadow, New York.
Jon Gerrard graduated with a degree in psychology from Princeton University, where he also served as president of the Tae Kwon Do Club for two years. For more than ten years he has taught martial arts to law enforcement agents in New York.