Dr. Leonard Sax MD PhD enrolled in the Massachusetts Institute of Technology (MIT) in Cambridge Massachusetts in the fall of 1977; he graduated Phi Beta Kappa from MIT in January 1980, at the age of 19. He then went on the University of Pennsylvania, where he earned both a PhD in psychology, and an MD. He did a three-year residency in family medicine in Lancaster Pennsylvania. Dr. Sax has been continuously certified by the American Board of Family Medicine since 1989. He is licensed to practice medicine in Maryland and Pennsylvania. He is currently certified in Advanced Cardiac Life Support and in Pediatric Advanced Life Support.

In March 1990, Dr. Sax launched a primary care medical practice in Montgomery County Maryland. From 1990 through 2008, Dr. Sax provided primary care and urgent care services to children and adults. In 2001, Dr. Sax began visiting schools and meeting with parents’ groups. In 2005, Doubleday published his first book "Why Gender Matters." In 2007, Basic Books published his second book "Boys Adrift." In June 2008, Dr. Sax sold his practice to his associate and began a 5-year sabbatical, working with schools and community groups across the United States and around the world. In 2010, Basic Books published his third book "Girls on the Edge." In December 2015, Basic Books published his fourth book "The Collapse of Parenting."

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 380 schools since 2001. He has appeared on the TODAY Show, CNN, National Public Radio, PBS, Fox News, Fox Business, the Canadian Broadcasting Corporation, the British Broadcasting Corporation, the Australian Broadcasting Corporation, New Zealand Television, and many other national and international media.

In the fall of 2013, Dr. Sax returned to clinical practice. He lives with his wife and daughter in Chester County, Pennsylvania.

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