He was a gentleman rider who owned, bred and trained horses for steeplechase, polo, flat racing, driving, show jumping, and fox hunting.

He was almost always seen in a tweed English cap, waistcoat, breeches and tall boots throughout his life in person and in captured images.

[1] Always the consummate horseman with a disdain for automobiles, famously Brose would not allow NBC radio to drive their equipment truck onto the estate to broadcast the races.

The most famous horse under Brose was a gelding he sold to his wife Florence for $5.00 (one pound) at the time just prior to the 1933 English Grand National was Kellsboro Jack (Ireland).

[15] Clark owned various properties throughout the United States, including an apartment in The Dakota, estates in Cooperstown, Old Westbury on Long Island, in Aiken, South Carolina, and in Leicestershire, England.

[16] The manor house at Iroquois Farm was razed in 1981 to make room for what was planned to be the relocation of the Clark Sports Center.

A sprawling estate in the Aiken Winter Colony acquired in 1929, known as Habersham House, that was built in 1927 for Kenneth Schley (Master of the Essex Hunt).

The home was renamed Kellsboro after the Grand National victory and upon his death, went to Clark's nephew George H. "Pete" Bostwick.

A seasonal residence in England at Melton Mowbray, Leicestershire, the spiritual home of English fox-hunting.

[1] In addition, his first wife owned Foshalee Plantation, a 11,456-acre (46.36 km2) quail hunting property in northern Leon County, Florida, just north of Tallahassee from 1938 until 1949.

Some of the tack was purchased on behalf of the Rockefeller family to furnish a carriage house being opened as a museum as part of the Kykuit estate in Pocantico Hills.

[citation needed] The rare books room at the National Sporting Library & Museum in Middleburg, Virginia, is named in his honor.