Pat Levitt, PhD imparts the biological neuroscience behind toxic stress responses by examining pre- and post-natal stages, including a look at epigenetics. He is Scientific Director of the National Scientific Council for the Developing Child, Senior Fellow at the Center for the Developing Child, (Harvard University), Provost Professor of Neuroscience, Psychiatry & Pharmacy, and Director of the Neuroscience Graduate Program at the Keck School of Medicine, University of Southern California.