Paul Mellon was an American philanthropist and an owner/breeder of thoroughbred racehorses. He is one of only five people ever designated an "Exemplar of Racing" by the National Museum of Racing and Hall of Fame. He was co-heir to one of America's greatest business fortunes, derived from the Mellon Bank created by his grandfather Thomas Mellon, his father Andrew W. Mellon, and his father's brother Richard B. Mellon. In 1957, when Fortune prepared its first list of the wealthiest Americans, it estimated that Paul Mellon, his sister Ailsa Mellon Bruce, and his cousins Sarah Mellon and Richard King Mellon, were all among the richest eight people in the United States, with fortunes of between US$400 and 700 million each.

Andrew William Mellon, known also as A. W. Mellon, was an American banker, businessman, industrialist, philanthropist, art collector, and politician. From the wealthy Mellon family of Pittsburgh, Pennsylvania, he established a vast business empire before moving into politics. He served as United States Secretary of the Treasury from March 9, 1921, to February 12, 1932, presiding over the boom years of the 1920s and the Wall Street Crash of 1929. A conservative Republican, Mellon favored policies that reduced taxation and the national debt of the United States in the aftermath of World War I. Mellon also helped fund and manage Kennywood Park in West Mifflin, Pennsylvania.