David Rockefeller Sr., 92

Net worth: $2.7 billion
No. 149 on Forbes' 400
In case you're slow on the uptake, Rockefeller = oil. David is the current patriarch of the family and son of Standard Oil tycoon John D. Rockefeller Sr., as well as a noted entomologist (why not?) whose beetle collection numbers about 160,000. Following a lifetime in which his charitable donations are estimated at over $900 million, the 92-year-old is accelerating the altruism now, giving $100 million to MoMA in 2005 and another $100 million to Rockefeller University.

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