One of the most influential evangelical leaders today is Rick Warren, pastor of Saddleback Church, a megachurch in southern California. Warren is perhaps best known for his mega-selling book, THE PURPOSE DRIVEN LIFE. Since its release in 2002, it has sold more than 25 million copies, making it one of the best-selling books in history. But what is less known is that Warren and his wife Kay have donated most of their earnings to help heal some of the world's worst ills.