Massad F. Ayoob is an internationally-known firearms and self-defense instructor. As Director of the Lethal Force Institute in Concord, New Hampshire, he taught police and civilian self-defense techniques to both law enforcement officers and private citizens worldwide since 1974. Now he is head of the Massad Ayoob Group, through which he continues to teach.

Ayoob frequently serves as an expert witness in trials where use of force or self-defense concerns are being argued. He has served as a part-time police officer in three departments and currently holds the rank of Captain in the Grantham, New Hampshire police department.

In addition to teaching, he serves on the Advisory Board of the International Law Enforcement Educators’ and Trainers’ Association. In 1998, he was voted the Outstanding American Handgunner of the Year, an honor he shares with luminaries like Jeff Cooper, Charles Askins, Bill Jordan, Walter Walsh, William B. Ruger and others.

Massad has authored many books and countless articles on firearms, combat techniques, self-defense, and legal issues, and was a featured presenter on the television show Personal Defense TV, hosted by Tom Gresham.

In addition to his work as an expert witness, author and instructor, Massad is a former Vice Chairman of the Forensic Evidence Committee of the National Association of Criminal Defense Lawyers (NACDL), and is believed to be the only non-attorney to ever hold this position. Massad’s course for attorneys, titled "The Management of the Lethal Force/Deadly Weapons Case" was, according to Jeffrey Weiner (former President of NACDL), "the best course for everything you need to know but are never taught in law school."