David Matsumoto is a psychology professor at San Francisco State University (SFSU). His mastery of microexpressions, gestures, non-verbal behavior, culture, and emotion have made him one of the leading experts in these areas. Currently, he is the director of the Emotion and Culture Research Laboratory at SFSU, focused on studies that revolve around social interaction, and communication. In addition, Matsumoto founded the East Bay Judo Institute in El Cerrito, California. He has a seventh-degree black belt and is a licensed class-A trainer and referee.