Leonard Sax, MD, PhD, is a board-certified family physician, psychologist, and the New York Times bestselling author of Why Gender Matters, Girls on the Edge, and The Collapse of Parenting. Dr. Sax has visited more than five hundred schools worldwide and has appeared on major radio and television programs and networks including the Today show, CBS, CNN, Fox, and NPR’s Weekend Edition. Dr. Sax lives with his family in Chester County, Pennsylvania.