Jay Brousseau, founder and sensei of ShoDan Karate, works with other accomplished martial artists to teach programs for children and adults. The school favors ancient techniques that hail from Okinawa, the Japanese island where 19th-century karate master Sokon Matsumura honed his skill. Sensei Jay aligns himself with the Beikoku Shido-kan Karate-do Association headed by Sensei Seikichi Iha. Instructors from all over the world—including Russia, Israel, and Australia—seek out the instruction and support of this master. To maintain their membership, Sensei Jay and his team must train regularly with Sensei Iha. All of their adult students who test for black belts must also do so in front of Sensei Iha, who nods when they succeed and opens a trapdoor when they fail.