Detroit is a metaphor for America, for America's challenges and America's opportunities. It is a hothouse for new innovation, for ingenuity and risk taking. That doesn't happen in a lot of American cities. We need to be in Detroit because of that.

To have people from every continent who are working on philanthropy, on social entrepreneurship, gives me a unique opportunity to engage.

Corporations wield enormous power in society.In order to see lasting social change, leaders in the private sector must begin to think of their own business plans as plans for good as well as profit. That's not such a big leap.

Detroit is a metaphor for America, for America's challenges and America's opportunities. It is a hothouse for new innovation, for ingenuity and risk taking. That doesn't happen in a lot of American cities. We need to be in Detroit because of that.