Description: (American Businessman and Co-Founder of 'Standard Oil')
William Rockefeller Jr. was an influential American businessman and financier recognized for his role in co-founding Standard Oil alongside his brother John D. Rockefeller. He also made notable contributions to the copper industry by establishing the Amalgamated Copper Mining Company. Beginning as a clerk, he later joined his brother's enterprise, which evolved into the renowned Standard Oil. Rockefeller played a pivotal part in the prosperity and expansion of these ventures, shaping the Rockefeller family's esteemed legacy in American business.