Gershon Ben Keren has been training in Krav Maga since 1994 in both Israel and Europe. He holds a 3rd Degree Black Belt in Krav Maga in Israel, where he also received his teaching certification. He has been trained by some of the IDF's (Israeli Defense Forces) most experienced and respected Krav Maga instructors. In December 2011, he was inducted into the "Museum of Israeli Martial Arts" at the Israeli Martial Arts Center in Herzilya. He has taught Krav Maga to civilians, security personnel, law enforcement agencies, and to members of elite military units and Special Forces. He also holds a 2nd Degree Black Belt in Judo and has won regional and national titles in Judo tournaments.
He has a Master's Degree in Psychology, with particular reference to violence and aggressive behavior, and incorporates this knowledge into the reality based self-defense training that he provides. He lives and teaches Krav Maga in Boston, running Krav Maga Yashir Boston.