Seigo Okamoto was born in 1925 in Yubari City, Hokkaido, and began his aiki studies with Master Kodo Horikawa in 1963 in Hokkaido, Japan.
He received his 7th dan rank in 1974, and was promoted to shihan, the master instructor level, in 1978.
He separated from the Kodokai to found Daito-ryu Aikijujutsu Roppokai after moving to Tokyo in 1977. The technical syllabus of the Roppokai is very different from the traditional Daito-Ryu techniques of Sokaku Takeda
His art focuses on quickly executed aiki techniques, that seized an attackers power, and took their balance away from them, with an absolute minimum body movement.
Okamoto is the author of two books and two videos on Daito-ryu Aikijujutsu and travels regularly to Denmark and Italy to give seminars.
Morihei Ueshiba developed Aikido from his combat studies of Daito-ryu Aikijujutsu with Sokaku Takeda, and his spiritual studies with the Omoto Kyo and Onisaburi Deguchi.
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There are several interesting videos on youtube of Master Okamoto Sensei, and I recommend that you check them out. Some of them will show you very fast aiki techniques from grabs that quickly control his attackers.
It seems that some of his uke's tend to exaggerate the effects with grunts of surprise. But, this was a common theme with several aiki masters, who made it look as if their uke's were falling for them...
I suspect they allowed no opening for strong attacks!
Seigo Okamoto died on January 17, 2015, just a few weeks before his 90th birthday. He had many top students who carry on his teachings.
I have one of his technical dvd's, which includes excellent wrist and body movement that can help Aikido students in their studies.
Check out several important Aiki Masters trained by Sokaku Takeda. These include Yukiyoshi Sagawa, Kodo Horikawa, Morihei Ueshiba, and many more. For more on Aiki-Jujutsu masters... Click Here