"Standard Oil Company" was the empire of which business mogul?

"Standard Oil", in full "Standard Oil Company and Trust", is an American company and corporate trust that from 1870 to 1911 was the industrial empire of John D. Rockefeller (July 8, 1839 – May 23, 1937) and associates, controlling almost all oil production, processing, marketing, and transportation in the United States.

The company’s origins date to 1863, when Rockefeller joined Maurice B. Clark (6 Sept. 1827-9 March 1901) and Samuel Andrews (February 10, 1836 - April 15, 1904) in a Cleveland, Ohio, oil-refining business. In 1865 Rockefeller bought out Clark, and two years later he invited Henry M. Flagler (January 2, 1830 - May 20, 1913) to join as a partner in the venture. By 1870 the firm of Rockefeller, Andrews, and Flagler was operating the largest refineries in Cleveland, and these and related facilities became the property of the new "Standard Oil Company", incorporated in Ohio in 1870. By 1880, through the elimination of competitors, mergers with other firms, and the use of favorable railroad rebates, it controlled the refining of 90 to 95 percent of all oil produced in the United States.