Dale Purves is Professor of Neurobiology, Psychology and Neuroscience, and Philosophy at Duke University. He is a graduate of Yale University and Harvard Medical School. Upon completion of an internship and assistant residency at Massachusetts General Hospital, Dr. Purves was a post-doctoral fellow in the Department of Neurobiology at Harvard Medical School and subsequently in the Department of Biophysics at University College London. He joined the faculty at Washington University School of Medicine in 1973 where he was Professor of Physiology and Biophysics, and came to Duke in 1990 as the founding chair of the Department of Neurobiology in the School of Medicine. From 2003 to 2009 he was Director of Duke’s Center for Cognitive Neuroscience, and is now Director of the Neuroscience and Behavioral Disorders Program of the Duke-NUS Graduate Medical School in Singapore. He is a member of the National Academy of Sciences, the American Academy of Arts and Sciences, and the Institute of Medicine. Miriam Boleyn-Fitzgerald has spent 15 years publishing on scientific topics geared to curious readers of all backgrounds. She holds a degree in physics from Swarthmore College, and is a recipient of the Thomas J. Watson Fellowship and the Ida M. Green Award for graduate studies in Science, Technology, and Society at MIT. She has worked as a staff writer for President Clinton's Advisory Committee on Human Radiation Experiments, and as an analyst for the Natural Resources Defense Council and the Union of Concerned Scientists. Andrew Koob graduated from Northwestern University in 1998 and from Purdue University with a Ph.D. in neuroscience in 2005. After graduation, he worked as a postdoctoral research fellow in pediatric neurosurgery at Dartmouth, followed by positions as a postdoctoral fellow for research in Parkinson’s Disease at University of California, San Diego, and as a researcher in molecular neurogenetics at the University of Munich, Germany.