Michel Brousse, a sixth-degree black belt, teaches the cultural history of sport and the didactics of judo at Bordeaux University in France. He is the author of numerous books and articles on these subjects. A former member of the French national judo team, he currently serves as Media Director of the International Judo Federation. David Matsumoto is a sixth-degree black belt and an acclaimed psychologist specializing in intercultural adjustment, culture, and emotion. He is a professor of psychology at San Francisco State University, and the head instructor of the East Bay Judo Institute, one of the USA's top dojos. He is a renowned judo coach and official and author of several books about judo as well as culsture and psychology. Both Michel Brousse and David Matsumoto are official researchers for the International Judo Federation.