Sonja Lyubomirsky is Distinguished Professor at the University of California, Riverside and author of the bestselling The How of Happiness and The Myths of Happiness, which has been translated in thirty-nine countries. She has received numerous awards for her work and has been featured in a wide range of media, including the New York Times, the Washington Post, and The Atlantic and on the Today show, NPR, and CNN. She lives in Santa Monica, California, with her family.

Harry T. Reis is Dean's Professor in the Department of Psychology at the University of Rochester, which honoured him with the Georgen Award for Distinguished Achievement and Artistry in Teaching in 2009. He has received many other awards, and his work is frequently featured in the media, including NPR's Hidden Brain, Scientific American, Psychology Today, and the New York Times. He lives in Rochester, New York, with his family.