Full Name: John Davison Rockefeller Sr.; Profession: American business magnate, industrialist, and philanthropist; founder of the Standard Oil Company; Nationality: American; Born: July 8, 1839. Birthplace: Richford, New York, United States; Generation: Gilded Age industrialist and “robber baron” of the late 19th‑century era of rapid American industrialization and corporate consolidation; Chinese Zodiac: Earth Pig (Year of the Pig, 1839); Zodiac Sign: Cancer; Age in 2026: 187 (would be 187 years old in 2026 if alive); Marital Status: Married to Laura Celestia “Cettie” Spelman Rockefeller; Children: Elizabeth “Bessie” Rockefeller Strong, Alice Rockefeller, Alta Rockefeller Prentice, Edith Rockefeller McCormick, John D. Rockefeller Jr., Description: American oil tycoon who rose from modest beginnings as a Cleveland bookkeeper to build Standard Oil into a vast corporate trust that controlled almost all oil production, refining, marketing, and transportation in the United States, becoming America’s first billionaire and one of the richest individuals in business history; his company’s dominance led to the landmark 1911 Supreme Court antitrust decision that dismantled Standard Oil into dozens of successor firms, several of which evolved into modern energy giants, while his personal fortune fueled an unprecedented wave of organized philanthropy—he endowed institutions such as the University of Chicago and created major foundations, including the Rockefeller Foundation, channeling hundreds of millions of dollars into education, public health, scientific and medical research, the arts, and agriculture, helping to professionalize philanthropy, influence global public health campaigns, and shape the evolution of modern capitalism, corporate regulation, and the very idea of the ultra-wealthy industrialist as a public benefactor even as he remained a controversial figure for harsh competitive tactics and monopoly power. Cause of Death: He died in his sleep on May 23, 1937, at his winter home, The Casements, in Ormond Beach, Florida, United States, from sclerotic myocarditis and related heart disease at the age of 97.