Tadashi Nakamura is the founder and Kaicho (chairman) of the World Seido Karate Organization headquartered in New York City.
Tadashi Nakamura was born on February 22, 1942, in the town of Maoka on the island of Karafuto. Nakamura trained in various martial arts including Goju-Ryu, Kendo, and Kyokushin. In 1956 he started studying with Mas Oyama and he had reached the rank of shodan(1st-degree black belt) on May 6, 1962.
When he was 19 years old (1961) he made his first tournament appearance, the All-Japan Student Open Karate Championship, where he was placed first. In 1962, he took part in a match against a Muay Thai of the Lumpinee Boxing Stadium. The contest had been to determine which country had the ‘best’ martial art.