Master William Patterson Mr. Patterson is from Chicago and has studied and taught martial arts at K.S. Hyun's Hapkido School since 1980. He holds a 4th degree black belt in Hapkido and received a Meritorious Service Award from the Korea Kido (Hapkido) Association, Seoul, Korea. He is a former police officer, a Vietnam veteran and retired Navy Captain. Mr. Patterson has a graduate degree from the Illinois Institute of Technology.