Barbara Lee Fredrickson is an American professor in the department of psychology at the University of North Carolina at Chapel Hill, where she is the Kenan Distinguished Professor of Psychology. She is also the Principal Investigator of the Positive Emotions and Psychophysiology Lab at the University of North Carolina at Chapel Hill. Fredrickson is a social psychologist who conducts research in emotions and positive psychology. Her main work is related to her broaden-and-build theory of positive emotions, which suggests that positive emotions lead to novel, expansive, or exploratory behavior, and that, over time, these actions lead to meaningful, long-term resources such as knowledge and social relationships. She is the author of Positivity, a general-audience book that draws on her own research and that of other social scientists. She also released a new book in January 2013, Love 2.0, which discusses the supreme emotion of love, micro-moments of connection as well as how love can affect your biological and cellular make-up over time. Fredrickson earned her Ph.D. from Stanford University in 1990. 

June 15th, 1964 in (Age 59)