Krav Maga Instructor Team

Teaching Israeli Krav Maga

Krav Maga Yashir Boston Instructors

Head Instructor - Gershon Ben Keren

Gershon Ben Keren is a 5th Degree Black Belt in Krav Maga who received his training, belts, and teaching certifications in Israel. In 2010 he was one of the first inductees into the Museum of Israeli Martial Arts in Herzliya, Israel. He is the author of three Amazon best-selling books on Krav Maga (published by Tuttle Press) and writes the weekly Krav Maga Blog. He first started training Krav Maga in 1993, and continues to teach and train in Israel, as well as bring Krav Maga instructors over from Israel and other countries to teach and share their experiences. He has written three Amazon best-selling books on Krav Maga (Tuttle Publishing).

He is a criminologist who has been working in the security industry since 1990. He holds two master's degrees. One in Psychology (Newcastle University) and the other in Criminology and Criminal Psychology (University of Essex). Using evidential research and his thirty plus years’ experience working in the security industry, the training programs at Krav Maga Yashir are up to date and relevant in the way that they deal with threats to personal safety and security. Gershon is a hands-on instructor whoteaches on a full-time basis, and teaches all the introductory/beginner clases (If you are interested in taking one of these please click here).

Meet Our Team

Krav Maga Woburn Instructor Liz Berrien

Liz Berrien

Assistant Instructor

Liz began training at Krav Maga Yashir in 2009 under Head Instructor Gershon Ben Keren. 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 also a Green Level Coach with USA Boxing, and holds an active shooter response instructor certificate with ALICE.

Krav Maga Woburn Instructor Nick Zagami

Nick Zagami

Assistant Instructor

Nick Zagami has been working in law enforcement experience since 2017, 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 Woburn 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).