JACK DORSEY

$4.2 BILLION  SELF-MADE SCORE: * SOURCE: TWITTER, SQUARE AGE: 42 RESIDENCE: SAN FRANCISCO

PHILANTHROPY SCORE:

A licensed massage therapist, Dorsey wrote dispatch software for ambulances and cop cars before cofounding two now publicly traded companies: online payments firm Square and social media firecracker Twitter. Square, whose stock dropped in the past year, announced in August it would sell its food ordering platform Caviar to competitor DoorDash for $410 million. Dorsey, the CEO of both companies, is also known for his “wellness” habits—from meditating in a cave in Myanmar to eating only one meal a day. $4.2 BILLION  SELF-MADE SCORE: * SOURCE: SEMICONDUCTORS AGE: 56 RESIDENCE: LOS ALTOS, CA $4.2 BILLION  SELF-MADE SCORE: ( SOURCE: HEDGE FUNDS AGE: 63 RESIDENCE: NEW YORK