Dr. Choy is a clinical professor in the Dept. of Orthodontics at Yonsei University in Seoul, Korea. He was a research fellow and visiting professor in the University of Connecticut. Since then, he has continued his research in the field of biomechanics and has published many articles and published “The Biomechanical Foundation of Clinical Orthodontics” with Dr. Burstone. He has given many lectures on biomechanics around the world and currently running a private practice in Seoul Korea.