Net worth: $25 billion

Age: 78

Country: US

Industry: Retail

Source of wealth: Self-made; Nike

After a stint in the US Army, and with a Stanford MBA under his belt, Phil Knight convinced Tiger-brand shoemaker Onitsuka in the early 1960s to allow him to distribute Tiger shoes under the name Blue Ribbon Sports — the name Knight picked that predated his swoosh-logo-clad company Nike. Knight worked full-time as an accountant as he launched his new brand, and by 1968 he had built up enough of a rapport with customers that he was able to leave the CPA life behind. Knight now serves as chairman emeritus of Nike.

Nike has built its success on celebrity and athlete endorsement deals, starting with running prodigy Steve Prefontaine in 1973 and continuing with one of the most successful shoe marketers of all time in Michael Jordan, whom Nike signed to a five-year endorsement deal in 1984 worth roughly $500,000 per year. The biggest NBA star today is still under the Nike roof, with LeBron James signing a lifetime contract with the brand in 2015 reportedly in excess of $1 billion.

Knight's wealth has decreased by $1 billion over the last year.