The Father of American Ninjitsu; the first American Ninja. Professor Duncan successfully demonstrated Ninjitsu in the 1960s, although receiving acknowledgement from the Japanese government, he was intentionally omitted from Black Belt magazine for several years. I mention Black Belt magazine because they have been considered the most reliable source of journalism pertaining to American martial arts. Their failure to acknowledge Professor Duncan and other great Black martial artists has radically affected the economics of the martial arts in America. According to the bio on his website he was a member of the United States Marine Corp Judo team, where he earned a black belt, he was a master of Hakko Ryu Jujitsu, Dai-nippon Jujitsu Ryu, Sosuishi Ryu, Kin Dai Gakko Ryu, Aikido, Aiki-Jujitsu, Kempo, Kobujitsu (weaponry), and Shinobino-jitsu (Ninjitsu). Ronald Duncan at Oriental World of Self Defense