Photo: Submissioncontrol.com & Polaris John Danaher is a BJJ black belt under Renzo Gracie, and is known as one of the best BJJ instructors in the world. The New Zealand born black belt has been praised by the BJJ community as being a master and brain of the art. Danaher is a highly intelligent individual, who has a Master degree … Continue reading John Danaher On How To Counter Big Slams in Grappling