Diane Sawyer, Simon Cowell and Oprah Winfrey are all celebrities who have achieved fame and fortune in their lives. On "Oprah's Master Class" they (and other celebrities) share the stories of their success. They discuss what has shaped their lives and the greatest lessons they have learned along the way. The celebrities not only talk about their successes but also some of their failures, disappointments and heartbreaks they have experienced through the years.