Larry Young, PhD, is the director of the Center for Translational Social Neuroscience, the William P. Timmie Professor of Psychiatry at Emory Univer­sity School of Medicine, and chief of the Division of Behavioral Neuroscience and Psychiatric Disorders at Yerkes National Primate Research Center. He lives in Atlanta.

Brian Alexander is an award-winning journalist and the author of several books, including Rapture: How Biotech Became the New Religion andAmerica Un­zipped: The Search for Sex and Satisfaction. He lives in San Diego.