Kaicho Tadashi Nakamura is the founder and president of the World Seido Karate Organization. He began his adventure with karate in 1953 year in age 11 years. He got his first experiences in the Goju under management of Sensei Kei Miyagi, the son of the founder of style. In 1956 year Nakamura began trainings at Masutatsu Oyama`s Dojo, founder of the Kyokushin Karate and got 1 Dan degree. He was the youngest student of Kyokushin in Japan which got black belt then.

In 1961 year in age 19 years T. Nakamura won first place in Open Karate Championships of Japan. Year later became national hero, knocking out master of Tai Kickboxing in the game which had to show which nation has the more effective art of fight.

In these years Nakamura also began work as instructor of karate. In years 1961-1965 he worked as instructor in Camp Zama - the military base of United States of America near Tokyo. By 3 years he also was in Toho the coach of team of Medical Academy. When got 7 Dan degree in Kyokushin Karate, he became main instructor in Central Honbu in Tokyo.

In 1966 year Nakamura became personally chosen by Masutatsu Oyama to representing the Kyokushin Karate in U. S. A. At the same year Nakamura mooved to New York and established small Dojo in Brooklyn district. In 1971 year Nakamura appointed organization the North American Kyokushin Karate.

In 1976 year Tadashi Nakamura decided cancel his membership in Kyokushin Karate and established the World Seido Karate Organization where teaches his own philosophy of way of karate. Seido marks honest road.