David Hopkins, PhD, is a psychologist with 21 years of experience, combining psychological principles relating to violence and psychotherapy with martial arts, self-defense, close protection, and in investigative work against terrorists and criminal elements, including organized crime. He has taught psychology relating to violence at universities in both the US and abroad, is a chief of the (Gidon)Israeli Krav Maga Association in Germany, and serves as a consultant to an international paramilitary and close protection team. David Hopkins resides in Germany.