Hackley School is a private college preparatory school located in Tarrytown, New York and is a member of the Ivy Preparatory School League. Founded in 1899 by wealthy philanthropist Mrs. Caleb Brewster Hackley, Hackley was intended to be a Unitarian alternative to the mostly Episcopal boarding schools throughout the Northeast. Since its founding, Hackley has dropped its sectarian affiliations and changed from all-boys to coeducational. Hackley is divided into three schools on the same campus: the Lower School, the Middle School, and the Upper School.
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