288. Johnelle Hunt
$2.8 billion self-made score: & source: trucking
age: 85 residence: fayetteville, ark. dropout, u. of central arkansas Hunt, who studied elementary education before she quit college and got married, has donated more than $50 million to universities and K-12 schools. Her fortune comes from her 17% stake in J.B. Hunt Transport Services, which she cofounded with her late husband in 1969.