Sidney Dillon Ripley (January 11, 1863 – February 24, 1905)[1] was an American insurance executive and prominent member of New York society during the Gilded Age.

"[4] Beginning in 1885, Ripley worked for The Equitable Life Assurance Society,[5] eventually serving as the corporate treasurer and a director for 13 years.

[1] The Ripley's had a 48-room country home in Hempstead on Long Island (which is today across from Hofstra University at California and Fulton Avenues), known as "Crossways.

The five-story brick-and-limestone Georgian home, that featured a columned portico and two-step porch, was completed shortly before his death in 1905.

Just before Ripley died, Harry sued Sidney and the Knickerbocker Trust Company alleging "misconduct in managing his property.

[31] His wife received their Long Island home, and all "jewelry, horses, carriages, and harness, and all property of the deceased for life.