Leonard Sax MD PhD graduated Phi Beta Kappa from the Massachusetts Institute of Technology (MIT) at the age of 19, and then went on to the University of Pennsylvania, where he earned both a PhD in psychology, and an MD. He completed a 3-year residency in family practice in Lancaster, Pennsylvania. For 19 years, Dr. Sax was a practicing family physician in Maryland, just outside Washington DC. He now sees patients in West Chester, Pennsylvania (west of Philadelphia). In 2005, Doubleday published his first book Why Gender Matters; an updated edition will be published by Harmony in 2017. His second book, Boys Adrift, was published in 2007. His third book Girls on the Edge was published in 2010. His most recent book The Collapse of Parenting was published by Basic Books in December 2015 and became a New York Times bestseller. Dr. Sax has spoken on issues of child and adolescent development not only in the United States but also in Australia, Bermuda, Canada, England, Germany, Italy, Mexico, New Zealand, Scotland, Spain, and Switzerland. He has visited more than 400 schools since 2001. He has appeared on the TODAY Show, CNN, National Public Radio, Fox News, PBS, the Canadian Broadcasting Corporation, the British Broadcasting Corporation, the Australian Broadcasting Corporation, New Zealand Television, and many other national and international media. Find him online at leonardsax.com