Todd K. Shackelford received his Ph.D. in evolutionary psychology in 1997 from the University of Texas–Austin. He is Professor and Chair of the Department of Psychology at Oakland University in Rochester, Michigan, where he is Co-Director of the Evolutionary Psychology Lab. He led the founding of new Ph.D. and M.S. programs, which launched in 2012. Shackelford has published over 250 peer-reviewed articles and chapters and has edited 10 volumes, and his work has been cited over 7,000 times. Much of Shackelford’s research addresses sexual conflict between men and women, with a special focus on testing hypotheses derived from sperm competition theory. Since 2006, Shackelford has served as editor of Evolutionary Psychology.Virgil Zeigler-Hill received his Ph.D. in social-personality psychology in 2004 from the University of Oklahoma. He is a member of the faculty in the Department of Psychology at Oakland University. He has published more than 80 peer-reviewed journal articles, book chapters, and books. His primary research interests are in four interrelated areas: self-esteem, narcissism, cognitive representations of the self, and interpersonal relationships.