Singleness of purpose is one of the chief essentials for success in life, no matter what may be one's aim.

John D. Rockefeller

Entrepreneurs

John D. Rockefeller

John D. Rockefeller (1839-1937) founded Standard Oil in 1870 and controlled 90% of U.S. refining at its peak. After becoming America's first billionaire, he pioneered systematic philanthropy in medicine and education.

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