Martha Beck is a monthly columnist at "O: The Oprah Magazine." She is the New York Times bestselling author of "The Joy Diet," "Finding Your Own North Star," and "Expecting Adam: A True Story of Birth, Rebirth, and Everyday Magic." Martha has coached hundreds of individuals over the past 15 years, and recently, NPR called her "the best-known life coach in America." She has taught career development at the American Graduate School of International Management, performed research at Harvard Business School, and consulted to numerous Fortune 500 corporations.