The group consulted with John Dewey and observed one of his students, Mary Hammett Lewis of Columbia University, then an instructor at the prestigious Horace Mann School in New York City.

Originally for girls, the upper school began accepting boys in the early 1930s, then offering the only private, co-educational experience in the Buffalo area.

The estate, in Snyder, had a large mansion, farmhouse, barn, small forest, orchard and pond, and a stone house at the entrance.

In January 2016, it was announced that the school had retained CannonDesign as architect for the Knopp-Hailpern Science Center, the first new building constructed on campus in 11 years.

A Thanksgiving Feast is held annually, during which students and faculty from all three schools (Lower, Middle and Upper) assemble in the refectory for a traditional dinner and accompanying festivities.

The teams compete throughout the year, accruing points through a variety of athletic and academic events, with the annual winning color inscribed on a trophy.

The Buffalo Rapids of the American Basketball Association played home games at the school from November 2005 to February 2006.

On 27 April 2018, Park announced that it had retained legal counsel to conduct an investigation into allegations of past teacher abuse.