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Official website of Willy Cahill former U.S. Olympic Judo Coach and head instructor of Cahill's Judo Academy in San Bruno, California. From 1963 to 1996, Cahill has produced over 800 National and International medal winners. His Elite Athletes have represented the United States at numerous international events. Cahill also in 1996 opened The World of Martial Arts Supplies, a company specializing in martial arts supplies, weapons, uniforms, exercise and training equipment, videos, and nutritional and herbal products.