Peter Arrell Browne Widener II was a prominent American racehorse owner and breeder. He inherited a fortune from his father, Joseph E. Widener, a founding benefactor of the National Gallery of Art in Washington, D.C.. His father was also a major figure in Thoroughbred horse racing, being President of Belmont Park racetrack from 1925 to 1939, and builder of the 1932 Hialeah Park racetrack in Miami, Florida.

Joseph Early Widener was a wealthy American art collector who was a founding benefactor of the National Gallery of Art in Washington, D.C. A major figure in thoroughbred horse racing, he was head of New York's Belmont Park and builder of Miami's Hialeah Park racetrack in Florida.