Seigo Yamaguchi (April 13, 1924 – January 24, 1996) 9 Dan Aikido, Hombu Dojo Shihan and one of the most important, early teachers in Aikikai.
Yasuno Masatoshi was born on September 7, 1948, in Kanazawa city which is in the Ishikawa prefecture, Japan. Yasuno Masatoshi is a Hombu Shihan with an 8 Dan Aikikai rang and is considered to be Yamaguchi Sensei’s technique heir along with the Seishiro Endo, Yoshinobu Takeda and Christian Tissier.
Shoji Seki Shihan was born on 6 March 1950 in Yamagata Prefecture, Japan. While he was a student in a Musashi Institute of Technology in Tokyo a group of the aikidokas was giving a demonstration and in 1969 Shoji joined.
Yoshiaki Yokota Shihan was born in 1958. He was a Captain of the Judo Club in a Junior High School at the age of 12. He soon found more interest in Karate and joined an Aikido club in a High School.