http://www.battle.at/kogaThe Founding Father of Koga Black Dragon Ninjitsu in America.
biography
A 5th Dan in Ninjitsu 3rd Dan in Shotokan Karate and 1st Dan in Judo publisher of over 30 books with more than 3 decades of martial arts training and experience. Actor, artist, stuntman, soldier, bodyguard, Spy, Director Emeritus of DOJO training and operations U.S.A, Canada and Mexico.
Teaching and holding lectures worldwide on Black Dragon Ninjitsu he began his studies in the martial arts at the age of 12. His father a career soldier ha frequent opportunities to attend a variety of judo classes. Almost every post where they were stationed had one. At the time judo was the only oriental system available to western students. Karate was an advanced level that was offered only to seniors, although there were a few striking techniques in judo known as atemi-waza.
Since most of the members of these clubs were professional soldiers,they had little time for children so, as in the shaolin monastery experience, he was more often than not restricted to sweeping the mat and observing than actual instruction until age 14 and at brown belt level: although the experience of often changing judo clubs had left him with little regard for earning belt rank , since judoka of that period held to tradition that one must begin each time from the beginning.
While at University, he attended a karate demonstration given by a yudansha who had trained in okinawa. His style was shotokan and he too had learned while his father was stationed overseas. By then karate was fairly widespread and there were hints of an even more deadly art known as kung fu that began to surface. Adding the repertoire of kicks and puches to his arsenal of judo and wrestling holds, he soon picked up the system, based in large part on the discipline of patience and practice he had learned in the gentle way.
A student of Count Juan R. Dante Grandmaster of the black dragon fighting society and appeared on south afican late nite television
When Kim Sensei, because does not think of himself as, nor refer to himself as, a ''master'' much less a ''grandmaster'' just a fellow student on the path, a little ahead of some, far behind others.
I like how he adds "Spy" to his resume.

But really, where in this biography does he learn the traditional art of Ninjitsu? As I can tell, he started with Judo, moved on to Shotokan, and then picked up Kung Fu puches and kicks and mixed then all together. Maybe I'm just too ignorant on the history and origins of Ninjitsu to understand.