Steven W. Gangestad, PhD, is Distinguished Professor of Psychology at the University of New Mexico. His research has covered a variety of topics in evolutionary behavioral science, including the determinants of sexual attraction, changes in women's sexual psychology across the ovarian cycle, the effects of genetic compatibility between mates on relationship qualities, individual variation in developmental precision and its manifestations in neuropsychology, and influences of men's testosterone levels.

Jeffry A. Simpson, PhD, is Professor of Psychology and Director of the Doctoral Minor in Interpersonal Relationships at the University of Minnesota. His research interests include adult attachment processes, human mating, idealization in relationships, empathic accuracy in relationships, and dyadic social influence. Dr. Simpson is a fellow of the American Psychological Association and the Association for Psychological Science. He serves as Associate Editor for the Journal of Personality and Social Psychology: Interpersonal Relations and Group Processes.

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