Jesús Jiménez began his martial arts career at the age of 10 in Judo. In 1978 he began training in Isshin-Ryu Karate under Sensei Eduardo González in Guayama, Puerto Rico. About a year later he became the sensei of the dojo as a ni-kyu when Sensei González went away to college.

He soon began commuting to Bayamón, 70 miles away, to train with Juan D. López. He continued to supervise the Guayama Dojo as well as organizing another dojo at the University of Cayey.

He studied law in college, and while there was elected class president, president of the history club and secretary of the politics club.  1983 marked a major year of accomplishments for Sensei Jiménez: He graduated from college, was accepted into law school, received his ni-dan, and was appointed head instructor of the Order of Isshin-Ryu dojo in Guayama. He opened another dojo in Puerto Nuevo during law school. 

In addition to Isshin-Ryu, he has studied Aikido, Okinawan Kobudo under Sensei Kimo Wall, and San Yama Bushi Jujutsu.

He stresses the values of honor and loyalty to his students, as well as demanding excellence in the physical realm. 

Sensei is married to his lovely wife Doris, and they have four children: Solimar, Dorimar, Alejandra, and Jesús Jr.