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Krav Maga Yashir Instructor Team

Authentic Krav Maga Direct From Israel

Krav Maga Yashir Boston Instructors

Krav Maga Boston Instructor Gershon Ben Keren

Head Instructor - Gershon Ben Keren

Gershon Ben Keren – 5th Degree Black Belt - originally started his Krav Maga training as an instructor with the IKMF (International Krav Maga Federation), under Eyal Yanilov. He has trained with many of Imi Lichtenfeld’s original black belts including Miki Assulin, Avi Moyal and Haim Gidon, in Israel. He has also been an instructor under Grand Master, Dennis Hanover. His instructor certificates and Black Belts were completed in Israel. In 2010 he was inducted into the Museum of Israeli Martial Arts in Herzliya, Israel. He has written three best selling books on Krav Maga (Tuttle Publishing) click here to learn more) and is the author of the weekly Krav Maga Blog.

He has worked globally in the security industry for over thirty years, both operationally and in training/consultancy roles; working with professional agencies and departments, along with a wide array of corporate clients and organizations; He is a specialist in threat and risk management/mitigation and has worked in Europe, the US and the Middle East advising clients on threat recognition, prediction and avoidance. He has two master’s degrees in Criminology and Criminal Psychology. His teaching on real world self-protection and Krav Maga, combines his own experiences with the most up to date research regarding violence and violence prevention. Gershon teaches the majority of the classes at Krav Maga Yashir Boston.

Meet Our Team

Krav Maga Boston Instructor: Liz Berrien

Liz Berrien

Assistant Instructor

Liz began training in Krav Maga under Gershon Ben Keren in 2009. She is a Certified Personal Trainer and Functional Training Specialist with ACE®, and a Certified Strongman Instructor under both CrossFit and World’s Strongest Man, Svend Karlsen (Global Strongman Gym), as well as a Certified Instructor with TRX®. Liz is a Green Level Coach with USA Boxing, and holds an active shooter response instructor certificate with ALICE.

Krav Maga Boston Instructor: Nick Zagami

Nick Zagami

Assistant Instructor

Nick Zagami has six years of law enforcement experience, including county-level corrections and municipal policing. He is a MPTC certified firearms instructor and a member of his regional response team. During his time in law enforcement, Nick has undergone specialty training in Crisis Intervention, the Law of Self Defense, and ALERRT's Active Attack Integrated Response (AAIR). He has a passion for helping people understand the law and how to best navigate that system in order to increase personal protection.

Krav Maga Boston Instructor: Justin Brown

Justin Brown

Assistant Instructor

Justin has been training at Krav Maga Yashir since 2017, with previous experience in Taekwondo and Aikido, and is a Certified Group Fitness Instructor with ACE®. He's a certified EMT, medical volunteer with the MA Metro East Medical Reserve Corp, and a STOP THE BLEED® Instructor. Justin also has over 15 years of firearms experience and holds an instructor certification with ALERRT’s Civilian Response to Active Shooter Events (CRASE).