John J. Ratey, M.D. is a clinical professor of psychiatry at Harvard Medical School. He is the author or co-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.

Edward Hallowell, M.D.,is a board-certified child and adult psychiatrist, a world-renowned keynote speaker, and theNew York Timesbestselling author or co-author of more than twenty books, includingDriven to Distraction(with John J. Ratey), which sparked a revolution in our understanding of ADHD. A graduate of Harvard College and Tulane Medical School, Dr. Hallowell was a Harvard Medical School faculty member for twenty-one years.

A regular columnist forADDitudemagazine, he is also the host of the weekly podcastDistraction. He is the founder of The Hallowell Centers in Boston MetroWest, New York City, San Francisco, and Seattle. He lives in the Boston area with his wife and their three children.