Seishiro Endo, born 1942, is an 8th dan ranked Aikikai aikido master teacher. Endō is among the few living people who studied directly under aikido founder Morihei Ueshiba.
He trained at Aikikai Hombu Dojo with master teachers including Hiroshi Tada, Mitsunari Kanai, and Yasuo Kobayashi.
When Endo was 30 years old he dislocated his right shoulder. According to an interview, that event brought him to a turning point. After the injury, Yamaguchi said to him, “You’ve been doing aikido for 10 years now, but now you have only your left arm to use, what are you going to do?” This prompted Endo to pursue a different direction in his Aikido. His Aikido eventually became a lot softer and more contact-based.