Jin began training at the Renzo Gracie Academy after moving to New York for university. He has competed at the national and international levels in Brazilian Jiu Jitsu. He is a Black Belt under Renzo Gracie / John Danaher.

Jin has wrestled under the instruction of Hamid Kermanshah, NYAC wrestling coach and still practices with Mike Torriero, head coach of the Renzo Gracie Wrestling team. He has also spent time training Judo at the NYAC Dojo, studying with Teimoc Johnston Ono. Jin has also boxed since prior to moving to New York.

Additionally, Jin has coached and cornered fighters from the amateur to professional levels in MMA.

He holds a Bachelors degree in Business Management and a Masters degree in Education.

Eddie Cummings is a jiu jitsu black belt under John Danaher, being often referenced as one of the founding members of a group named as the Danaher Death Squad (DDS) out of Renzo Gracie’s Academy in New York City. Cummings is known as a revolutionary figure in this sport, particularly for his contribution in improving positions such as the heel hook, saddle (411) and ashi garami for submission grappling having won several important tournaments with this manoeuvre, more so in the ‘submission only’ rule-set. This includes wins at Polaris Jiu Jitsu Invitational and the Eddie Bravo Invitational (EBI).