Michael Eid, DSc, is Professor of Psychology at the Free University of Berlin, Germany. Dr. Eid is currently Editor of Methodology—European Journal of Research Methods for the Behavioral and Social Sciences and Associate Editor of the Journal of Positive Psychology. His main research interests are subjective well-being, mood regulation, multimethod measurement, and longitudinal data analysis.

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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.