Other billionaires who have pledged large sums of their money include film producer George Lucas, philanthropist David Rockefeller and oil investor T Boone Pickens.
Several of these swells, including Harriman and Percy Rockefeller, built their own cottages near the central clubhouse, which also wasn't far from the elaborate stables and kennel complex.
At the January meeting of the World Economic Forum in Davos, Switzerland, Pierre met the heads of the MacArthur and Rockefeller foundations, who moaned how poorly their grants were spent, or how they can't copy another program's success because of a "not invented here" bias.