Sybil L. Hart holds the position of Professor Emerita at Texas Tech University. Her books include Preventing Sibling Rivalry (Simon & Schuster), Handbook of Jealousy Jealousy: Theory, Research, and Multidisciplinary Approaches (Wiley-Blackwell), Infant Jealousy: Responses to Differential Treatment (Springer), and The Psychology of Rivalry (Nova). She has been the recipient of numerous awards from Texas Tech University, including the Chancellors Council Award for Distinguished Research, the Presidential Book Award, and the Barnie E. Rushing, Jr. Faculty Distinguished Research Award, as well as grant support from the National Institutes of Health. Her research on jealousy in infants has also attracted press coverage in national and international outlets such as Newsweek, Der Spiegel, and the NBC Today show. Her current research interests focus on the role of exclusivity in intimate relationships and lactation.

B.Ed. (Education), 1978, McGillUniversity, Montreal, Quebec, Canada
M.A. (Educational Psychology), McGill University, Montreal, Quebec Canada
Ph.D. (Experimental Psychology), 1995, Tufts University, Boston, MA

David F. Bjorklund is a Professor of Psychology at Florida Atlantic University where teaches graduate and undergraduate courses in developmental and evolutionary psychology. He served as Associate Editor of Child Development (1997-2001) and is currently serving as Editor of the Journal of Experimental Child Psychology (since 2007). His books include The Origins of Human Nature: Evolutionary Developmental Psychology (with Anthony Pellegrini); Origins of the Social Mind: Evolutionary Psychology and Child Development (edited with Bruce Ellis); Why Youth is Not Wasted on the Young: Immaturity in Human Development; Child and Adolescent Development: An Integrative Approach (with Carlos Hernandez Blasi); Psychology (with Peter Gray), and Children's Thinking: Cognitive Development and Individual Differences, now in its sixth edition. His current research interests include children's cognitive development and evolutionary developmental psychology.

B.A. (Psychology), 1971, University of Massachusetts, Amherst
M.A. (Psychology), 1973, University of Dayton
Ph.D. (Developmental Psychology), 1976, University of North Carolina, Chapel Hill
Honorary Doctorate (Doctor philosophiae honoris causa), University of Bern, Switzerland, 2015

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