John Ratey, M.D. is a clinical professor of psychiatry at Harvard Medical School. He is the author of numerous bestselling and groundbreaking books, including Spark, Driven to Distraction, and A User's Guide to the Brain. He lives in Cambridge, Massachusetts.
Richard Manning is an award-winning journalist. He is the author of eight books, including One Round River. His work has appeared in Best American Science and Nature Writing 2010, Harper's, the New York Times, the Los Angeles Times, and other publications.