Massad Ayoob has authored thousands of articles and more than a dozen books on firearms and self-defense topics, including "Gravest Extreme: The Role of the Firearm in Personal Protection"; "Combat Shooting with Massad Ayoob"; "Greatest Handguns of the World Volumes 1 and 2"; and two editions of "Gun Digest Book of Concealed Carry". He founded the Lethal Force Institute in 1981 and now trains through Massad Ayoob Group.