Dr. Yang, Jwing-Ming is a world-renowned author, scholar, and teacher of tai chi chuan. He has been involved in Chinese martial arts since 1961 and maintains over 55 schools in 18 countries. Dr. Yang’s writing and teaching include the subjects of qigong, kung fu, tai chi chuan, massage, and meditation. He is the author of over 35 books and 80 videos. Dr. Yang, Jwing-Ming teaches and resides at his YMAA Retreat Center in Arcada, California. David W. Grantham began his martial art training in 1989 and holds certificates as coach instructor and chin na instructor from YMAA International Schools. David is an airline pilot, author, and tai chi teacher. He teaches at the Hunterdon Wellness Center in Clinton, New Jersey. David Grantham resides in Hunterdon County, New Jersey with his wife, and two children.