Tokumura Sensei began his Isshin-Ryu career in April 1957 at the Agena, Okinawa dojo under Shimabuku Tatsuo Sensei. He eventually was assigned to assist in teaching at the dojo instructing many of the Marines such as A.J. Advincula, Harold Mitchum, Jake Eckonrode, Sherman Harrill and Tom Lewis.
After Shimabuku Tatsuo's death, Tokumura continued to teach at the Kinaka dojo of Shimabuku Kichiro. In March 1977, he was awarded his Shihan (Master teacher) license in Isshin-Ryu Karate. In July 1984, he was awarded his 6th Dan in Isshin-Ryu and also chose to test under the Japan Karate Federation where he received perfect 10 scores in his katas. At that time he was only 1 of 3 to ever recieve perfect 10's from the JKF board.
As a school boy, Tokumura would see Tatsuo Sensei training Kobudo with Taira Shinken. To further his own Kobudo, Tokumura trained under Akamine Eisuke Sensei, the sucessor to Taira Shinken on Okinawa. In 1987, he left Isshin-Ryu to study Goju-Ryu under Miyazato Eiichi, a senior student of Miyagi Chojun.
Since 1998, Tokumura Sensei has been travelling to the U.S. teaching RyuKyu Kobudo to many Isshin-Ryu practitioners. In April 2001, he was promoted to 9th Dan in Kobudo by the Traditional Kobujutsu Preservation Budo Association on Okinawa. Tokumura retired as a Captain from the U.S. Marine Corp. Security Forces that give security to American military bases on Okinawa. He has developed into a great Ambassador for the Island of Okinawa continuing to pass his martial knowledge to many Americans & Canadians in Isshin-Ryu.
He often says, " I don't teach karate & kobudo to make money. I teach to make friends."