Susan Nolen-Hoeksema, Ph.D. who died unexpectedly in January 2013 was Professor of Psychology at Yale University. She received her B.A. in psychology from Yale University and her Ph.D. in clinical psychology from University of Pennsylvania. Nolen-Hoeksema's research focuses on women's greater rates of depression compared to men and on the effects of rumination in depression. In addition to her peer-reviewed journal articles, she has published 12 books, including scholarly books, textbooks and books for lay audiences. Nolen-Hoeksema has won three major teaching awards and several awards for her research, including the David Shakow Early Career Award from the American Psychological Association (APA), the Leadership Award from the Committee on Women of the APA, and a Research Career Award from the National Institute for Mental Health. Geoff Loftus received his BA from Brown University, and Ph.D. from Stanford University. He has been professor at the University of Washington in Seattle since 1973, as well as visiting professor at MIT. He served as editor of Memory & Cognition, associate editor of Cognitive Psychology, and editorial-board member of various other journals. He has authored numerous books, book chapters, and articles. His research concerns human perception and memory, as well as mathematics, statistics, scientific methodology, urban design, and video games. He has testified as an expert witness in approximately 250 civil and criminal legal cases. Barbara L. Fredrickson, Ph.D. is Kenan Distinguished Professor at the University of North Carolina at Chapel Hill, with appointments in Psychology and the Kenan-Flagler School of Business. She received her B.A. in psychology from Carleton College and her Ph.D. from Stanford University. Fredrickson's research centers on emotions, especially positive emotions and their links to health and well-being. She has shared her research findings with scientists and students of psychology through scores of peer-reviewed journal articles and also with a general audience through her book, Positivity (2009, Crown). Her research and teaching have been recognized with several honors and awards, including the American Psychological Association's Templeton Prize in Positive Psychology, and the Society for Experimental Social Psychology's Career Trajectory Award. Christel Lutz, Ph.D. is a lecturer in Psychology at University College Utrecht, the Netherlands. She received her MSc. in physics from Utrecht University and her Ph.D. in experimental cognitive psychology from the University of Pennsylvania, where she taught courses in perception and cognitive psychology. She is a fellow in the Department of Social Sciences at University College Utrecht, and has developed courses in experimental psychology and the psychology of human motivation. Her current research focuses on learning and motivation, and on the intellectual development of college students.
