The Zen Ei Kan International organization is affiliated with some of the most prestigious martial arts organizations in the world.  Sensei Martyn and other senior members of the organization maintain active membership in each organization and have achieved Dan rank in each respective art.  Members of ZEKI also have the opportunity to achieve certification in each organization with which we are affiliated.

Sang Cook Kim, Founder


At Zen Ei Kan International, we train in, and certify dan ranks in, Ju Sool Kwan Hapkido. Ju Sool Kwan Hapkido was founded by Sang Cook Kim.  Ju Sool Kwan (“school of the soft art”) is a style of Hapkido drawing on Kim’s ChungDoKwan roots, but with an emphasis on the principles and techniques of Aikido and Judo.  

As Hapkido was never a distinct art or style in and of itself, but rather a blending of Daito-ryu Aikijujutsu, Judo and Korean Karate, our philosophy at Zen Ei Kan is that to truly understand Ju Sool Kwan Hapkido, you must understand its roots.  Thus, we not only practice Hapkido as an integrated art, but we continue to offer world-class training in its root arts; ChungDoKwan, Aikido and Judo. 

In 2021, Sang Cook Kim appointed Mr. Martyn as his full successor and inheritor of Ju Sool Kwan Hapkido, with ultimate authority regarding promotions, curriculum, and doctrine. 

Hae-Man Park, President


The World Chung Do Kwan Association was founded by Won Kuk Lee in 1944.  Chung Do Kwan was the second oldest of the martial arts schools, or “kwans”, that were established following the Japanese Occupation of Korea, being established shortly after the Song Moo Kwan.

Chung Do Kwan remains the largest and most prominent of the original Korean Tae Kwon Do ‘Kwans’ and is a body which precedes the formation of large international corporate Tae Kwon Do organizations such as the World Taekwondo Federation, the International Tae Kwon-Do Federation and the Kukkiwon etc.  

The World Chung Do Kwan Association continues to issue its own traditional rank qualifications and certification. The President of the World Chung Do Kwan is Grand Master Park, Hae-Man.

Tadayuki Satoh, Founder and President


Renaissance Yawara is an international association specializing in philosophy, principles and practice of Tomiki Aikido and Kodokan Judo.  With a direct link to Jigoro Kano (Founder of Judo) and Kenji Tomiki (Tomiki Aikido), this organization is dedicated to the practice and preservation of the principles of Jigoro Kano as originally taught and the pedagogy of Kenji Tomiki.  Today there are several AFFILIATED DOJOS around the world (Japan, America, and Europe) that study the principles of Tomiki Aikido and Kodokan Judo.

The organization was founded by Mr. Tadayuki Satoh.  Satoh is passionate about exposing the world to the connection between Kodokan Judo and Tomiki Aikido and to help a new generation both understand and appreciate the true intent of Kano’s Judo as well as the immense contribution Tomiki made in his research and fusion of the principles and techniques of Kodokan Judo and Aikido.  Due to Satoh Sensei’s unique history and connection to both the founder of Judo as well as Tomiki Aikido, he is uniquely qualified to teach on the original tenets of each art as well as their historical and technical connections

Masanobu Kitayama, Vice-President; Fumiaki Shishida – Shihan; Masako Tomiki, Chairperson


Japan Aikido Association (JAA) is a non-profit organization authorized by the Cabinet Office, Government of Japan. It pursues the development and growth of Tomiki Aikido which the late former professor of Faculty of Education at Waseda University, Kenji Tomiki (1900~1979) founded and developed.

JAA holds technical sessions and tournaments of Tomiki Aikido. JAA regards Tomiki Aikido as that of a life time education and contributes to the promotion of a healthy life style through Tomiki Aikido.

Kunikazu Yahagi, Soke


Ryushin Shouchi Ryu is a school of kobudō (ancient martial arts) specializing in iaijutsu (quick-draw sword art) founded by Kawabata Terutaka in 2006.  The origins of the Ryushin Shouchi Ryu can be traced to the Tenshinsho Jigen Ryu, a branch tradition of the Tenshin Shōden Katori Shintō-ryū. The current headmaster of the Ryushin Shouchi Ryu is Yahagi Kunikazu. 

Ryushin Shouchi Ryu is practiced across the globe with several schools in the United States, Europe and Japan. Every year, Yahagi makes official trips to conduct training courses abroad, where he receives the warm support of his overseas students.  The Ryushin Shouchi Ryu also takes part in the Annual Kobudo Dedication Demonstrations (Kobudō Hōnō Enbu Taikai) at Katori Shrine every year; an event that has been taking place for over 25 years.

Haruki Uemura, President


The Kodokan Judo Institute is the headquarters of the worldwide judo community. The Kodokan was founded in 1882 by Kanō Jigorō, the founder of judo, and is now an eight-story building in Tokyo.  Literally, means “to lecture”, means “way,” and kan is “a public building”. Together it can be translated as “a place for the study of the way.”

The Kodokan is authorized as a non-regular school by the Tokyo Metropolitan Government. Its courses include the theories and practice of judo, and matters of general education.  The Kodokan issues Dan ranks, and many judoka around the world become Kodokan members and have their ranks registered with the Kodokan.