The richest-ever American, John D. Rockefeller, had a personal fortune of about $320 billion in today's dollars. John D. Rockefeller's grandson David Rockefell

The richest-ever American, John D. Rockefeller, had a personal fortune of about $320 billion in today's dollars. John D. Rockefeller's grandson David Rockefeller was the head of Chase and Exxon, with Exxon being the most profitble company in the world (http://money.cnn.com/galleries/2011/fortune/1104/gallery.fortune500_most_profitable.fortune/index.html http://money.cnn.com/galleries/2011/fortune/1104/gallery.for...). Wikipedia says David Rockefeller's net worth is $2.9 billion (http://en.wikipedia.org/wiki/David_Rockefeller http://en.wikipedia.org/wiki/David_Rockefeller) -- that number seems too low to be right.