226. Mark Shoen
$3.3 billion self-made score: % source: u-haul age: 66 residence: Phoenix
B.a., college of The holy cross ’73 His parents, L.S. and Anna Mary Shoen, cofounded U-haul, the truck- and trailer-rental company, in 1945. Mark sided with his brother Joe (No. 288) in a nasty family feud in which Joe wrested control of U-haul away from their father. He is no longer involved in running U-haul but owns an estimated one fifth of its parent company, Amerco.