This is Soke Gozo Shioda. (Kancho-Sensei). He was a top student of O-Sensei, and founder of Yoshinkan Aikido. Soke means “founder” and Kancho means “highest instructor in any art/style”. Biographical information about Gozo Shioda and the founding of Yoshinkan Aikido can be found at the link below.
Gozo Shioda – wikipedia