About Us


The Way of the Winds is a comprehensive system of self defense.

Training includes:

  • Jujutsu & Taijutsu (a Japanese term for “body skill” or body art”), body movement for unarmed defensive tactics — such as joint locking & throws.
  • Evasive movements, & striking patterns.
  • Kobujutsu (traditional weaponry) is also included in the system.
  • Hoda Korusu (improvised weaponry—cell phones, pens, keys).

The owner, & Chief Instructor at Duncan Martial Arts is Gregory Duncan. Hanshi Gregory Duncan is the son of legendary martial arts pioneer, the late Professor Ronald Duncan Sr., who not only is the founder of The Way of the Winds Martial Arts System but is also considered the “Father of American Ninjutsu.” Gregory has been involved in & exposed to various disciplines of martial arts since childhood & has over 50 years of experience.

Gregory has attained a great deal of proficiency in the martial studies of Jujutsu, Taijutsu, Ninjutsu and Kobujutsu. Known for his precise and practical concepts of self defense, Gregory continues to broaden his approach to his Martial Arts training – while at the same time respecting the deep traditions that sustains his system.

Gregory has also been honored with several Martial Arts Hall of Fame awards – one of which is The World Professional Martial Arts Association Hall of Fame – and as a competitor, he has championed dozens of Martial Arts tournaments. Like his father, Gregory’s proficiency in the weapon arts of Kobujutsu and modern day weaponry, has garnered him national acclaim.


 The Way of the Winds™ System was founded by the late Professor Ronald Duncan, who has often been stated to be a practical practitioner of the martial arts. He always strived to broaden and develop his skills and knowledge, from knife throwing to the stealthy discipline of Ninjutsu. The Way of the Winds™ System not only entails training in Ninjutsu, but also encompasses a comprehensive approach to all of the many facets of Ronald Duncan’s history as a martial artist. Self defense and combative strategies are the main emphasis of training as students are also exposed to the traditional Budo arts such as Taijutsu /Jujutsu, Aikijujutsu, non-traditional as well as traditional weaponry (Kobujutsu). Today Professor Ronald Duncan is acknowledged as the “Father of American Ninjutsu” as well as starting the Koga Ryu movement. There was a time when Ninjutsu was not being practiced publically in this country, but Ronald Duncan was one of a few individuals who dared to seek out and study the arts of the ninja. Since then, other Ninjutsu practitioners and schools have emerged. The Way of the Winds™ System’s philosophy is to endure, which is something that Professor Ronald Duncan had done for over 50 years as a martial arts pioneer.

Click here to learn more about Professor Ronald Duncan 

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