23. ELON MUSK

$19.9  SELF-MADE SCORE: *

BILLION SOURCE: TESLA MOTORS, SPACEX AGE: 48 RESIDENCE: LOS ANGELES PHILANTHROPY SCORE: Musk is working to rehab his image following a tumultuous 2018, much of it the result of his Twitter usage. Things are on the upswing at Tesla, his electric carmaker, which churned out roughly 87,000 cars in the second quarter, 33,700 more than the same quarter last year. Still, shares are down 14% from the heady stock price 12 months ago. Musk taught himself to code as a kid and sold his first video game, Blastar, for $500.