The Vanderbilt family is an American family who gained prominence during the Gilded Age. Their success began with the shipping and railroad empires of Cornelius Vanderbilt, and the family expanded into various other areas of industry and philanthropy. Cornelius Vanderbilt's descendants went on to build grand mansions on Fifth Avenue in New York City; luxurious "summer cottages" in Newport, Rhode Island; the palatial Biltmore House in Asheville, North Carolina; and various other opulent homes. The family also built Berkshire cottages in the western region of Massachusetts; examples include Elm Court.

William Henry Vanderbilt was an American businessman and philanthropist. Known as "Billy," he was the eldest son of Commodore Cornelius Vanderbilt, an heir to his fortune and a prominent member of the Vanderbilt family. Vanderbilt became the richest American after he took over his father's fortune in 1877 until his own death in 1885, passing on a substantial part of the fortune to his wife and children, particularly to his sons Cornelius II and William. He inherited nearly $100 million from his father. The fortune had doubled when he died less than nine years later.