John Perkins has been training and teaching martial arts and self-defense for over 50 years. He has taught hand-to-hand tactics to Marine combat units, Marine scout sniper units and military counterdrug forces. He also has instructed law enforcement personnel from the FBI, New York City Police Department, New York State Police and the New York City Transit Police. Al Ridenhour, a lieutenant colonel in the United States Marine Corps Reserves, has been training in the martial arts since 1985. He has studied tai chi, isshinryu karate and ken jitsu. An all-conference wrestler in high school who later learned boxing in the Marine Corps, Ridenhour is also a sixth-degree master in guided chaos. Matt Kovsky is an editor for CBS Television. His work has earned him two Emmys, one for outstanding editing and another for producer of an outstanding entertainment series, as well as many other awards. He is trained in isshinryu karate and jeet kune do and has a fifth-degree black belt in guided chaos.