John Davison Rockefeller Sr. was an American business magnate and philanthropist. He was one of the wealthiest Americans of all time and one of the richest people in modern history. Rockefeller was born into a large family in Upstate New York who moved several times before eventually settling in Cleveland, Ohio. He became an assistant bookkeeper at age 16 and went into several business partnerships beginning at age 20, concentrating his business on oil refining. Rockefeller founded the Standard Oil Company in 1870. He ran it until 1897 and remained its largest shareholder. In his retirement, he focused his energy and wealth on philanthropy, especially regarding education, medicine, higher education, and modernizing the Southern United States.

Rockefeller was the second of six children born in Richford, New York, to con artist William A. Rockefeller Sr. and Eliza Davison. Rockefeller had an elder sister named Lucy and four younger siblings: William Jr., Mary, and fraternal twins Franklin (Frank) and Frances. His father was of English and German descent, while his mother was of Ulster Scot descent. One source says that some ancestors were Huguenots, the Roquefeuille family, who fled to Germany from France during the reign of Louis XIV and a period of religious persecution. By the time their descendants immigrated to North America, their name had taken German form. William Sr. worked first as a lumberman and then a traveling salesman. He claimed to be a "botanic physician" who sold elixirs, and was described by locals as "Big Bill" and "Devil Bill." Unshackled by conventional morality, he led a vagabond existence and returned to his family infrequently. Throughout his life, Bill was notorious for conducting schemes. In between the births of Lucy and John, Bill and his mistress and housekeeper Nancy Brown had a daughter named Clorinda, who died young. Between John and William Jr.'s births, Bill and Nancy had another daughter, named Cornelia.