Glen Burnie MMA (Mixed Martial Arts) - 3rd Degree Brazilian Jiu Jitsu (BJJ) Black Belt, Jon Garfield, shows how to get into the triangle choke from side control. Professor Jon runs a Martial Arts school in Millersville, MD. Visit the above website for additional information! br br Garfield Martial Arts br 657 Old Mill Rd, br Millersville, MD 21108 br (410) 260-0353 br br br GarfieldMMA.com br Facebook.comAnnapolisMixedMartialArts br Facebook.