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David A. Jones Sr.
78

How'd he get so rich? The co-founder and former chairman of Humana, Jones and partner Wendell Cherry started buying nursing homes in 1961. In 1968, Jones took the company public and by 1974, the company changed its name from Extendicare to Humana, and sold most of the nursing homes and began to buy hospitals. By the late Seventies, it had become the largest for-profit hospital system in the U.S. By the time Jones stepped down as chairman in 2005, Humana was a $20 billion company.

Learn more about Humana (HUM).