Soke Rudy Duncan began training in the martial arts in 1961, studying Tae Kwon Do in Syracuse, New York. In 1969, SiGung Duncan switched styles, studying Shorin-Goju karate until 1978. At this time, he began training in Shaolin Kempo, first under the Fred Villari system and eventually with Nick Cerio's organization. SiGung Duncan's instructor was 8th degree black belt, Professor James Bryant of Masters Self Defense Centers. He teaches Karazenpo Go Shinjutsu Shaolin Kempo in Syracuse, New York. The lineage of this art runs through Nick Cerio, and Grandmaster George Pesare to it's founder, Grandmaster Victor "Sonny" Gascon.
Soke Duncan continues to train with many of the martial artists in the Central New York area. He also encourages instructors of other styles to guest teach seminars at his dojo. Area instructors such as Sifu/Guro Dan Donzella have been frequent guests at Duncan's Martial Arts Academy. This has led to a diverse martial arts knowledge base which Soke Duncan draws upon to provide his students with the best possible training.
Soke Duncan has also conducted numerous community based seminars on youth violence. As a certified social worker, he has published several articles outlining strategies for teaching troubled youth. He has also written articles discussing methods for teaching karate to youth with special needs such as attention deficit and hyperactivity disorders.
He also devotes many hours to various community organizations. Soke Duncan has taught tai chi to a group suffering from Multiple Sclerosis through the MS Society. Soke Duncan has also led the development of an instructors manual to insure that things are taught in a consistent manner and that students understand the importance of history.
Soke Duncan's relaxed teaching style and sincere dedication to the martial arts have combined to make Duncan's Martial Arts Academy one of the most respected dojos in the nation.
On October 26, 2004 Soke Duncan was personally promoted to the rank of 6th Dan in the art of Karazenpo Go Shinjutsu and declared SiGung Duncan by Grandmaster Victor "Sonny" Gascon.