Jake Semsem

Jacob Semsem is a distinguished jiu-jitsu black belt and instructor at Legion American Jiu-Jitsu in San Diego. His journey in the sport is marked by impressive achievements and a unique background that sets him apart in the jiu-jitsu community.

Shortly after making his mark on the international stage by claiming the European Championship title in 2024 and the American National Championship title, he was promoted to blackbelt in 2025. His competitive success is built on a foundation of diverse athletic experience, including a background as a 181lb powerlifter, where he honed his strength and discipline.

Prior to his full-time commitment to jiu-jitsu, Jake pursued academic excellence, graduating in 2021 with a degree in biology and a minor in chemistry. This scientific background informs his analytical approach to jiu-jitsu, allowing him to break down techniques with precision and clarity.

Jacob’s journey with Legion AJJ began in 2020 when he attended a competition camp for the Pan American Championships. Inspired by the experience, he made the bold decision to relocate from his hometown to Southern California, dedicating himself to training full-time at Legion. This move proved transformative, accelerating his progress and competitive success.

As an instructor, Jacob brings a unique blend of competitive insight, scientific reasoning, and a diversity of techniques to his classes. His teaching style emphasizes both the technical intricacies and physical demands of jiu-jitsu, helping students develop a comprehensive skill set. Jacob’s classes are known for their rigorous, analytical approach, balanced with practical application for competition and self-defense scenarios.

Jake’s journey from powerlifter to Jiujitsu champion exemplifies the transformative power Jiujitsu can have on one’s life. You can find him on the mat at Legion American Jiu Jitsu 5 days a week teaching children and adults.