The Rockefeller family is an American industrial, political, and banking family that owns one of the world's largest fortunes. The fortune was made in the American petroleum industry during the late 19th and early 20th centuries by brothers John D. Rockefeller and William A. Rockefeller Jr., primarily through Standard Oil. The family had a long association with, and control of, Chase Manhattan Bank. By 1987, the Rockefellers were considered one of the most powerful families in American history. The Rockefeller family originated in Rhineland in Germany and family members moved to the Americas in the early 18th century, while through Eliza Davison, with family roots in Middlesex County, New Jersey, John D. Rockefeller and William A. Rockefeller Jr. and their descendants are also of Scots-Irish ancestry.

William Avery Rockefeller Jr. was an American businessman and financier. Rockefeller was a co-founder of Standard Oil along with his elder brother John Davison Rockefeller. He was also a part owner of Anaconda Copper, which was the fourth-largest company in the world by the late 1920s. Rockefeller started his business career as a clerk at 16. In 1867, he joined his brother's company, Rockefeller, Andrews & Flagler, which later became Standard Oil. The company was eventually split up by the Supreme Court in 1911. Rockefeller also had a significant involvement in the copper industry. In 1899, Rockefeller and Standard Oil principal Henry H. Rogers joined with Anaconda Company founder Marcus Daly to create the Amalgamated Copper Mining Company, which later returned to the name Anaconda Copper.