Randy J. Larsen received his PhD in Personality Psychology from the University of Illinois at Champaign-Urbana in 1984. In 1992 he was awarded the Distinguished Scientific Achievement Award for Early Career Contributions to Personality Psychology from the American Psychological Association, and in 1987 he received a Research Scientist Development Award from the National Institute of Mental Health. He has been an associate editor at the Journal of Personality and Social Psychology and the Personality and Social Psychology Bulletin, and has been on the editorial boards of the Journal of Research in Personality, Review of General Psychology, and the Journal of Personality. Randy Larsen has served on several Scientific Review Groups for the National Institute of Mental Health and the National Research Council. He is a Fellow in the Association for Psychological Science and the American Psychological Association. His research on personality has been supported by the National Institute of Mental Health, the National Science Foundation for Cognitive Neuroscience, and the Solon Summerfield Foundation. In 2000 he was elected president of the Midwestern Psychological Association. He has served on the faculty at Purdue University and the University of Michigan. Currently Randy Larsen is chairman of the Psychology Department, and the William R. Stuckenberg Professor of Human Values and Moral Development, at Washington University in St. Louis, whe he teaches Personality Psychology and other courses. He lives in St. Louis with his wife and two children. David M. Buss received his PhD in 1981 from the University of California at Berkeley. He served on the faculties of Harvard University and the University of Michigan before accepting a professorship at the University of Texas at Austin, where he has taught since 1996. Buss received the American Psychological Association (APA) Distinguished Scientific Award for Early Career Contribution to Psychology in 1988, the APA G. Stanley Hall Award in 1990, and the APA Distinguished Scientist Lecturer Award in 2001. Books by David Buss include The Evolution of Desire: Strategies of Human Mating (Revised Edition) (Basic Books, 2003), which has been translated into 10 languages; Evolutionary Psychology: The New Science of the Mind (3rd ed.) (Allyn & Bacon, 2008), which was presented with the Robert W. Hamilton Book Award; The Dangerous Passion: Why Jealousy Is as Necessary as Love and Sex (Free Press, 2000), which has been translated into 13 languages; and The Handbook of Evolutionary Psychology (Wiley, 2005). Buss has authored more than 200 scientific publications and has also written articles for The New York Times and the Times Higher Education Supplement. He appears in the ISI List of Most Highly Cited Psychologists Worldwide, and as the 27th Most Cited Psychologist in Introductory Psychology textbooks. He lectures widely throughout the United States and abroad and has extensive cross-cultural research collaborations. David Buss greatly enjoys teaching, and in 2001 he won the President's Teaching Excellence Award at the University of Texas.