In 1973, millionaire entrepreneur Millard Fuller and his wife Linda left behind their materialistic lifestyle and crumbling marriage to start over as missionaries in Zaire. On returning to Georgia in 1976, they founded Habitat for Humanity to bring new life to the poverty-stricken. Building Habitat into the mega-giant largest non-profit Housing ministry in the world with branches in some 110 countries, they were fired by the International Board in 2005, at which point they immediately founded The Fuller Center for Housing--now a rival to Habitat for Humanity. This is the story of two "simple giants."