264. Stephen Bechtel Jr.
$3 billion self-made score: $ source: engineering, construction
age: 92 residence: san francisco m.b.a., stanford ’48 Stephen and son Riley each own an estimated 20% of Bechtel, the family’s construction and engineering firm founded in 1898 by Stephen’s grandfather. Today Bechtel is run by Riley’s son Brendan. The $32.9 billion (sales) company is best known for projects like the Hoover Dam and Crossrail, London’s new rail tunnel, the first phase of which is due to open in December 2018.