William Douglas Sloane (February 29, 1844 – March 19, 1915)[1] was an American businessman, sportsman, philanthropist, and member of New York society during the Gilded Age.

[8] In 1866, he became a member of the firm,[9] and when the company was incorporated in 1891, Sloane became a director and remained on the board until his death.

[10] During the U.S. Civil War, Sloane enlisted as a private in Company H of the Seventh Regiment on October 31, 1862.

The couple were the parents of three daughters and two sons:[21] In New York, the Sloane's lived at 2 West 52nd Street in Manhattan.

[28][10] In 1885, William and Emily commissioned Peabody and Stearns to build Elm Court, the enormous shingle-style "cottage" in Lenox, Massachusetts.

[29][30] Sloane died of a kidney ailment on March 19, 1915, in Aiken, South Carolina,[1] of which he had been suffering from for a while.

[31] Following a funeral at St. Bartholomew's Church, he was buried in the Sloane Mausoleum in Moravian Cemetery at New Dorp, Staten Island.