How a Unitarian summer mansion in Tarrytown evolved into a prestigious modern preparatory school.

Science · Published 20 October 2026 Swipe more like this →

In short: Founded in 1899 by philanthropist Frances Hackley, this Tarrytown institution began as a Unitarian alternative to traditional Episcopal boarding schools. Over the last century, it has shed its religious affiliations and transitioned to coeducation, while maintaining its status as a prominent member of the Ivy Preparatory School League today.

The school's origins trace back to the generosity of Frances Hackley, a wealthy widow and Unitarian supporter who donated her summer mansion to establish a school for boys. The first students arrived in the autumn of 1899, residing in what is now Hackley Hall. Under the guidance of the first headmaster, Theodore Chickering Williams, and master Seaver Buck, the school expanded by purchasing a neighboring estate. This land became the foundation for the school's quadrangle, with iconic structures like Goodhue Hall and the Minot Savage building entering service by 1902–1903.

Throughout its history, Hackley has balanced its non-sectarian mission with a commitment to academic and extracurricular excellence. By the early 20th century, the school had already established a robust sports program, with football becoming a staple by 1900–1901. Its academic reputation grew quickly; a 1920 handbook noted that the vast majority of its two hundred and sixty alumni matriculated to Harvard and Yale. The school's cultural influence was further bolstered by figures such as composer Charles Griffes, who taught there from 1907 to 1920, and headmasters like Walter Boutwell Gage, who led the institution starting in 1908.

The school has navigated significant challenges and shifts in identity. During the Second World War, under the leadership of Madison Grant, it hosted liberal ministers to discuss war and peace. In 2007, a lightning strike caused a devastating fire that destroyed Goodhue Memorial Hall, resulting in the loss of the Kaskel Library and its 27,000 volumes. Despite such losses, the school has continued to evolve, transitioning to a coeducational model and maintaining a diverse boarding program. Today, it remains a notable institution, producing graduates who excel in fields ranging from documentary filmmaking and journalism to corporate leadership and the arts.

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