Book excerpt: Three decades ago in a cordoned-off corner of the developing world an angry Catholic priest armed only with pencil, paper, and crayons, declared a revolution. From a shanty school shared with Buddhists and Muslims in Bangkok's squatter slums, Father Joe Maier began his advance on abject poverty. Today, his Human Development Foundation and Mercy Centre charity is responsible for thirty-two preschools that have taught more than twenty thousand children how to read and write. Despite the crippling neglect found in impoverishment, he is raising international scholars and injecting a sense of purpose into shantytowns and squatter camps that used to have neither.