Michael Eid, PhD, is Professor of Methods and Evaluation at the Free University of Berlin in Germany. His research focuses on measurement theory, in particular on the development of psychometric models for longitudinal and multimethod research. Since the early 2000s, he has been contributing to the development of structural equation models for analyzing multirater data for different types of raters and research designs. His more applied research contributions are in the areas of subjective well-being, mood regulation, and health psychology.

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Randy J. Larsen, PhD, is the William R. Stuckenberg Professor of Human Values and Moral Development and Chair of the Psychology Department at Washington University in St. Louis. He conducts research on emotion, primarily in terms of differences between people, and studies such topics as subjective well-being, mood variability, jealousy, attraction, depression, and strategies for the self-management of self-esteem and emotion. Dr. Larsen is an elected member of the Society of Multivariate Experimental Psychology and is listed as one of the highly cited psychologists by the Institute for Scientific Information.