Joseph B. Walker provides tactical and technical information on responding to threats, such as active shooters, stalkers, and assailants through a variety of courses for civilians ...view moreJoseph B. Walker provides tactical and technical information on responding to threats, such as active shooters, stalkers, and assailants through a variety of courses for civilians and law enforcement. He uses his expertise as a retired police lieutenant and a tenth-degree black belt in martial arts with two world karate champions to formulate tactics and techniques that can defeat armed and unarmed assailants. He is also the author of Shots Fired: Surviving an Active Shooter/Assailant.view less