Gretchen Rubin is the author of several New York Times bestsellers, including The Happiness Project, The Four Tendencies, and Better Than Before, as well asher most recent book Outer Order, Inner Calm. Rubin’s books have sold more than 3.5 million copies worldwide, in more than 35 languages. She is also co-host of the award-winning podcast Happier with Gretchen Rubin with her sister Elizabeth Craft, a Hollywood TV writer. She is a member of Oprah's SuperSoul 100.