Farmer, philanthropist, photographer—Howard Graham Buffett wears many hats. Growing up, is father Warren made it clear that it was his responsibility to make his own way. When he came into possession of a broken tractor, he knew he had found his calling, and dedicated himself to grain farming in the Midwest. Meanwhile, an interest in photography took him to the far corners of the world, where he became involved in conservation projects. In 2006, with a major gift from his father and the help of his son, Howard Warren, he expanded his philanthropic operations and focused on hunger. The two Howards recently collaborated on a book, 40 Chances: Finding Hope in a Hungry World. Philanthropy sat down with Buffett to discuss the lessons in the book.