Peter B. Gray, Ph.D., is an associate professor of anthropology at the University of Nevada, Las Vegas. He is the co-author of Fatherhood: Evolution and Human Paternal Behavior and Evolution and Human Sexual Behavior, and coeditor of Endocrinology of Social Relationships. He earned undergraduate degrees in Anthropology and Geography at UCLA, where he also spent semesters abroad in Kenya and Costa Rica, whetting his appetite for an understanding of ourselves in evolutionary and cross-cultural perspective. He earned his graduate degrees (AM, Ph.D.) in Biological Anthropology at Harvard. Further steeped in the value of an evolutionary perspective, he was trained in comparative primate behavior, behavioral and reproductive endocrinology, and other areas, also spending two years as a postdoctoral scholar in Clinical Endocrinology, working with Dr. Shalender Bhasin. He joined the Anthropology faculty at UNLV in 2005. He teaches and conducts integrative research on human parenting and sexuality, and is involved in an ongoing collaborative study of fatherhood in Jamaica. He has two children, allowing him to both ponder and enjoy the rich realities of fatherhood.