The author lives and trains in California. Len has earned 5th Dan Black Belts in Tang Soo Do and Tae Kwon Do and 3rd Dan Black Belt in Soo Bahk. Len has been learning martial arts since he joined his first Tae Kwon Do class after graduating college. Len began teaching martial arts just prior to earning a Cho Dan (1st degree) Black Belt in Tae Kwon Do and Tang Soo Do styles of traditional Korean martial arts almost simultaneously. Len has been using aspects of martial arts in his own life to bring order, understanding and self-awareness. Len augments his martial arts with meditation, strength-based weight training, boxing skills including the hand speed, heavy bag, heavy bag and long distance running. Meditation keeps his body-mind-spirit in-tack, allowing him to train at higher levels of performance while minimizing injuries. Len has written and published may martial arts magazine articles and books. Writing and publishing more than 20 articles related to martial arts for several martial arts magazines including the prestigious Tae Kwon Do Times, Black Belt and the Mudo Dojang. Many of Len's articles illustrate the forgotten history and evolution of Korean martial arts. For this reason, Len's books and articles are often republished in other countries because of their excellent historical content, unavailable otherwise. Len's articles also appear on many martial arts web sites around the world. Len has also published 20 books on Korean martial arts. These books include the traditional styles of Tang Soo Do, Soo Bahk Do and Tae Kwon Do Korean martial arts. One of Len's books for children has earned the Good Housekeeping magazine's Seal of Approval. Len currently has more than 25 years of martial arts experience. Academically, Len has earned a B.S. degree in Physics and Mathematics, an M.S. degree and Ph.D. in Electrical Engineering and an M.A. degree in Education. Len had worked professionally as a Teacher, Physicist, Astrophysicist, Nuclear Physicist, a Mechanical Engineer, an aerospace engineer and an Electrical Engineer designing spacecraft and rockets for NASA and the U.S. military space programs and has been an executive at companies in several different industries.