B.J. Penn's life was significantly influenced by his multicultural upbringing, with parents Jay Dee Penn, an Irish American, and Loraine Shin, a third-generation Korean-American, playing a pivotal role in shaping his experiences. At the tender age of seventeen, Penn's introduction to Brazilian Jiu-Jitsu marked the beginning of a lifelong passion, which was sparked by his neighbor Tom Callos. Callos, in an effort to find like-minded individuals to train with, had posted flyers in local gyms, prompting Jay Dee Penn, B.J.'s father, to take the initiative and contact Callos, expressing interest on behalf of his sons.
As a result of this chance encounter, Callos went on to teach B.J. and his brother the fundamental principles of Brazilian Jiu-Jitsu, laying the foundation for their future endeavors in the world of martial arts. This early introduction to the discipline would ultimately have a profound impact on Penn's life, shaping his journey as a martial artist and competitor.
José Penn's journey began after completing his initial training, when he made the courageous decision to leave his familiar surroundings and relocate to the bustling metropolis of San Jose, California. The allure of the American Kickboxing Academy (AKA),a globally recognized institution, proved too great to resist, and Penn seized the opportunity to hone his skills under the expert guidance of renowned coaches Dave Camarillo and Bob Cooke. As he immersed himself in the vibrant martial arts community, Penn formed strong, lasting bonds with his mentors, which would serve as a vital foundation for his future success. During his time in San Jose, Penn underwent a profound transformation, as he made the life-altering choice to dedicate himself to a career in martial arts. Initially, his focus was not exclusively on the fast-paced and physically demanding world of mixed martial arts, but rather on cultivating his skills in a diverse range of disciplines, laying the groundwork for his future achievements in the world of combat sports.