John D. Rockefeller

John Davison Rockefeller was born in Richford, New York in 1839, the son of a traveling patent medicine salesman and a devoutly religious mother. He moved to Cleveland, Ohio as a teenager and began his business career as a bookkeeper, developing a meticulous attention to financial detail that would characterize his approach to business throughout his life. He entered the oil industry in 1863 as an investor in a Cleveland refinery, recognizing that the refining of crude oil — rather than its volatile and unpredictable extraction — represented a more controllable and scalable business opportunity.

John D. Rockefeller founded Standard Oil in Cleveland, Ohio in 1870 with his brother William and several partners, with the explicit ambition of rationalizing the chaotic early American oil industry through consolidation and operational efficiency. His methods — horizontal combination, preferential railroad rebates, and the use of the trust structure to coordinate nominally separate companies — made him the wealthiest person in American history and the first billionaire in the United States. By the time the Supreme Court dissolved Standard Oil in 1911, Rockefeller held an interest in companies that would eventually become ExxonMobil, Chevron, BP (through its Sohio subsidiary), and multiple other major energy firms. Though Rockefeller retired from active management of Standard Oil in 1897, he remained the company's largest shareholder and devoted his later decades to systematic philanthropy, founding the University of Chicago and Rockefeller University and creating the philanthropic frameworks that influenced American charitable giving for generations. He died in 1937 at the age of 97.