As a young boy, Luis Ubinas grew up poor in the South Bronx. His mother, bent over her sewing machine, imagined a better future for her son. From these humble beginnings, he went on to graduate from Harvard College, where he was named a Truman Scholar, and Harvard Business School, where he graduated with highest honors. He now heads the Ford Foundation, the second-largest philanthropy in the U.S., with more than $10 billion in assets.