John D.
Rockefeller

Born on July 8, 1839 in Richford, New York, John Davison Rockefeller grew up in modest circumstances. His father was a traveling salesman — and a con man. His mother was a strict, devout woman who instilled discipline and thrift. These two forces — hustler and ascetic — would define his character for life.

In 1863, at just 24 years old, Rockefeller entered the oil refining business in Cleveland, Ohio. The American oil industry was barely four years old, chaotic, and wildly speculative. Rockefeller saw not just opportunity in the chaos — he saw the solution to it.

"I would rather earn 1% off a hundred people's efforts than 100% of my own efforts."

In 1870, he incorporated Standard Oil of Ohio. Over the next decade, through horizontal integration, secret railroad rebates, and strategic acquisitions, Standard Oil came to control approximately 90% of all U.S. oil refining — a monopoly of staggering scale and historical impact.

By 1916, at age 76, Rockefeller became the world's first confirmed billionaire — his fortune equivalent to nearly $418 billion today, representing approximately 1.5% of the entire U.S. economy at the time. No individual has ever commanded such a proportion of a major economy's wealth before or since.