Kancho Shokei Matsui
Kancho Shokei Matsui, Director of the IKO Kyokushinkaikan, started Kyokushin Karate at age 13. In 1976, he joined the Kita Nagare-Yama Dojo in Chiba prefecture and managed to achieve the first level of Black Belt in a little over one year. In 1980, he placed fourth in the 12th All Japan Open Karate Championships, when he was just 17. Soon after, he became Chief Instructor of the International Kyokushin Headquarters school ("Honbu" Dojo) located in Tokyo. Both in 1981 and 1982, he took 3rd Place in the All Japan Open Karate Championships and then 8th place at the same event in 1983. At the Third World Open Karate Tournament in 1984, he took a remarkable 3rd place and became famous worldwide for his amazing sprit, strength and determination. He succeeded in winning the All Japan Championships in the consecutive years of 1985 and 1986 and then successfully completed the ultimate Kyokushin challenge, the "100 Man Kumite" in record time. In Japan, he became known as a man of "unparalleled genius", someone who comes along but once in a n eon. In 1987, he became the youngest ever, Champion of the World.
　

Shihan Bobby Lowe
In 1952, Mas Oyama gave a demonstration in Hawaii. A young Bobby Lowe saw him and was stunned by the power Oyama demonstrated. It was not as though Bobby Lowe was inexperienced in martial arts. Though still quite young, his achievements to date were not much less than those of Mas Oyama himself. His father had been a Kung Fu instructor, and he had participated in any fighting art he could find. By the age of 23, he was yondan in judo, nidan in kempo, shodan in aikido, and a highly regarded welterweight boxer.
It was not long before Shihan Lowe became the first Kyokushin uchi deshi or "live-in student" of Mas Oyama's. He trained daily with Mas Oyama for one and a half years. Eventually, an uchi deshi's time became "1000 days for the beginning". These uchi deshi became known as Wakajishi, or the "Young Lions" of Mas Oyama and only a few of the hundreds of applicants were chosen each year for the privilege of training full time under the Master.
In 1957, Shihan Lowe returned to Hawaii to open the first School of Oyama outside Japan. Shihan Lowe has shared his vast knowledge of "Kyokushin's" roots and beginnings with thousands of Kyokushin  students at countless camps, seminars and dojo classes by teaching the techniques of "Goshin Jitsu" as they were originally taught to him by Sosai Mas Oyama.

Shihan Seiji Isobe
In 1972, Sosai decided to open a Branch in South America and selected Shihan Isobe to launch the project, "You go to Brazil 1 year to teach", Sosai ordered, to which Isobe replied, "Osu" and he has made Sao Paolo his home ever since. During the last 3 decades, Shihan Isobe has personally grown IKO South America into one of the largest organizations outside of Japan, governing 100 schools in 6 countries and representing thousands of Kyokushin practitioners on the continent, including his most famous student, Kyokushin World Champion, Francisco Filho. Shihan Isobe was appointed to the International Committee soon after Sosai's passing. In the last few years, he has accomplished several Kyokushin milestones, including holding the first Mini World Championship in 1994 in Brazil,  bringing the first non-Japanese World Championship title to Brazil in 1999 and most recently, producing the prestigious World Cup Team Championship and taking his Brazil Team to yet another world victory.

　

Shihan Stuart Corrigal
Shihan Stuart Corrigal began training Kyokushin Karate in March 1968 with the Richmond Kyokushin Karate Club. Presently he is Branch Chief of the Canadian Kyokushin Karate Organization responsible for the Western & Central regions. As well as Head Instructor of the Richmond Kyokushin Karate Club, South Arm Dojo. Shihan Stuart has traveled extensively throughout the world training, competing, officiating and conducting IKO Officiating Seminars. He competed in the 14th All Japan Championships and the 3rd World Tournament in Tokyo. As the branch chief of Canada, he holds a number of important national and international events such as Canadian Championships, Winter&Summer Training camps and North American Black Belt Conference.