 At the moment he has already ended his second Karatedo book titled ""The Physics of Karatedo"".He started practicing Nihon Koden Shindo Ryu in 1975 when Hiroyuki Hamada was invited, by Felton Messina, to teach the style that he had created.Hamada spent one month in the Dominican Republic teaching Felton and his advanced students from the Kenpo Karatedo Association.