Frances E. Jensen, MD, is Professor and Chair of the Department of Neurology at the Perelman School of Medicine, University of Pennsylvania. Dr. Jensen has researched brain development from the neonatal period through adulthood. She was Professor of Neurology at Harvard Medical School, Director of Translational Neuroscience and Director of Epilepsy Research at Boston Children's Hospital, and Senior Neurologist at Boston Children's and Brigham and Women's Hospitals. She lectures widely about the teen brain at science museums, TEDMED, and high schools.