In 1962, Hal Price Headley died and bequeathed to Chandler four mares and 286 acres of the Beaumont Farm, with which she founded Mill Ridge Farm. In 1968, Chandler became the first American woman to breed an
Epsom Derby winner who was sold at auction,
Sir Ivor, a stallion descended from
Alcibiades, a champion bred by Chandler's father in 1927. Sir Ivor was sold to
Raymond Guest, an American businessman and U.S. Ambassador to Ireland, at Keeneland in 1966 for $42,000. After winning several major European races, Chandler's stallion influenced a shift in horse sales, emphasizing the U.S. commercial market and Keeneland, specifically. Mill Ridge Farm has raised and sold several notable horses since its founding, to include 2001 Horse of the Year
Point Given, 2011 Horse of the Year
Havre de Grace, and 2005 Kentucky Derby winner
Giacomo. Since 2000, Mill Ridge Farm has raised or sold seven Breeders’ Cup winners and 36 Grade 1 winners. ==Honors==