Isshin-ryu was founded by one of the great karate masters, Tatsuo Shimabuku, and is derived from several of the other, older classical styles.

Master Tatsuo Shimabuku, began learning karate at the age of 14 and devoted the rest of his life to its study and teaching. For 26 years he studied the other styles, Shuri-te, Shorin-ryu and Goju-ryu, each one under the master of its style.

Master Shimabuku took the best of each style, improved it and founded Isshin-ryu. From Master Motobu, Master of Shuri-te, he took the kumite; from Master Kiyan, Master of Shorin, he took the Kata and added improvements; from Master Miyagi, Master of Goju, he took Sanchin, the basis of all Okinawan karate.

Isshin-ryu, with roots going back 500 years, is a postwar development, modernized to meet the needs of today's world. It was founded in the 50's and has been taught ever since to American Marines stationed in Okinawa.

Shimabuku's reputation throughout Okinawa had reached its peak when WorldWar II struck the island. A business man as well as a karate teacher, the sensei's small manufacturing plant was completely demolished and he was bankrupt almost from the war's outset. He did his best to avoid conscription to the Japanese Army by escaping to the countryside where he worked as a farmer. As the situation grew more and more desperate for the Japanese and as the need to press the Okinawans into service became urgent, he was forced to flee.

As his reputation in karate spread among the Japanese, many soldiers began a thorough search as they wanted to study karate under him. The officers who finally caught up with him agreed to keep the secret of his whereabouts if he would teach them karate; it was in this manner that Master Shimabuku survived the war.

After the war, his business ruined and little chance of earning a living by teaching karate on the war-ravaged island, Master Shimabuku returned to farming and practiced karate privately for his own spiritual repose and physical exercise. Throughout Okinawa, he was recognized as the island's leading practitioner of both Shorin-ryu and Goju-ryu Karate.

In the early nineteen fifties, the sensei began to consider the idea of combining the various styles into one standard system. He could forsee the problems that were developing out of the differences among styles; he sagely concluded that a unification or synthesis of styles would enhance the growth of karate.

He consulted with the aged masters on the island, and with the heads of the leading schools. At first there was general agreement, but later his idea met resistance as the leaders of the various schools began to fear loss of identity and position. Sensei Shimabuku decided to go ahead on his own; thus Isshin-ryu Karate was born. On May 30,1975, Master Shimabuku passed away, leaving a legacy to the world of karate, and to all the future Isshin-Ryu students.