Joe Navarro served as an FBI agent specializing in counter-intelligence and behavioral assessment for twenty-five years. Since retiring, he has authored thirteen books in twenty-nine languages dealing with human behavior and body language. He has written for Psychology Today, the Washington Post, and the Wall Street Journal, and for nearly a decade he lectured annually at the Harvard Business School. He is the author of What Every BODY is Saying, the number-one-selling body-language book in the world.