John Danaher (born 1967, Washington, D.C., United States) is a New Zealander Brazilian jiu-jitsu and Mixed Martial Arts instructor. He holds a 4th degree black belt in Brazilian jiu-jitsu under Renzo Gracie, and is an instructor at the Renzo Gracie Academy in Manhattan.[1] Although born in the United States, Danaher grew up in New Zealand, until arriving in the United States in 1991 to study at Co... show more