Efrain “Tato” Rivera began his study of Isshinryu Karate when he was 15 years old. His first instructor was Sensei Eduardo Gonzalez. When Sensei Gonzalez moved to finish his studies in medicine, Mr. Rivera become a student of Sensei Jesus M. Jimenez.
Sensei Rivera added to his knowledge by practicing Judo from 1990 – 1996. In 1998, he was promoted to sandan in the Order of Isshinryu. He currently holds the rank of yondan in Order of Isshinryu Karate and in addition to his Isshinryu studies, he trains in Matayoshi Kobudo.