Vincent A. Cruz, a tenth-degree black belt in traditional Shotokan karate, is the founder and chief instructor of the International San Ten Karate Association (ISKA) and the Intern...ver maisVincent A. Cruz, a tenth-degree black belt in traditional Shotokan karate, is the founder and chief instructor of the International San Ten Karate Association (ISKA) and the International San Ten Martial Arts Federation (ISTMAF), based in Madera, California. He has worn the black belt for fifty-two years.ver menos