John Green is the award-winning, #1 bestselling author of books including Looking for Alaska, The Fault in Our Stars, Turtles All the Way Down, and The Anthropocene Reviewed. With his brother, Hank, John has co-created many online video projects, including Vlogbrothers and the educa­tional channel Crash Course. John serves on the board of trustees for the global health non­profit Partners In Health and spoke at the United Nations High-Level Meeting on the Fight to End Tuberculosis. Everything Is Tuberculosis was published today. You can visit John online at johngreenbooks.com or join the TB Fighters working to end tubercu­losis at tbfighters.org.

Dr. Laurie Santos is the Chandrika and Ranjan Tandon Professor of Psychology at Yale University. In addition to her work on the evolutionary origins of human cognition, Laurie is an expert on the science of happiness and the ways in which our minds lie to us about what makes us happy. Her Yale course, Psychology and the Good Life, teaches students how the science of psychology can provide important hints about how to make wiser choices and live a life that’s happier and more fulfilling. The class became Yale’s most popular course in over 300 years, with almost one out of four students enrolled. Her course has been featured in The New York Times; NBC Nightly News; Today; GQ; Slate; and O, The Oprah Magazine. The online version of the class—The Science of Well-Being on Coursera.org—has attracted more than 4 million learners from around the world. A winner of numerous awards both for her science and teaching, Santos was recently voted as one of Popular Science’s “Brilliant 10” young minds, and was named in Time magazine as a “Leading Campus Celebrity.” Her podcast, The Happiness Lab, is a top-3 Apple podcast and has attracted 100+ million downloads since its launch.