PATRICIA DANIELS is a writer and editor who specializes in science and history. She has been author or editor of a number of National Geographic books, including
Complete Guide to Brain Health,
The Body: A Complete User's Guide, and, for kids,
Ultimate Bodypedia. She lives in State College, Pennsylvania.
TODD B. KASHDAN is a professor of psychology at George Mason University and senior scientist at the Center for the Advancement of Well-Being. A frequent radio, television, and print media contributor on how people and organizations can thrive, he has contributed feature articles to the New York Times Magazine and the Washington Post, and made regular appearances on NPR. He blogs for the Huffington Post and Psychology Today. He is coauthor of The Upside of Your Dark Side and Curious? He lives in Clifton, Virginia.