 He was also featured in the A&E documentary, "The Martial Arts" and the Wesley Snipes-produced "Master of the Martial Arts".In addition to being cited in dozens of martial arts books, he wrote many articles on the way of martial arts, and also authored the book "Hapkido, The Korean Art of Self-Defense", which was published by Ohara Publications in 1974 and is now in its 23rd printing.He completed a series of ten instructional Hapkido DVDs which are in worldwide distribution.