Frank Sutliff Hackett (1878 – February 6, 1952) was an American educator and founder of Riverdale Country Day School.
[2] Hackett was born in Albany, New York,[3] and was educated at Trinity School and Columbia College, where he received his BA in 1899.
[4][5] He taught English at Columbia after graduation and worked for Henry Holt and Company before serving as assistant headmaster of the Berkeley School in New York City.
An early proponent of the Country Day School movement,[6] which envisions an environment where students can receive scholarly, intimate teaching in locales with abundant recreation space, Hackett founded Riverdale Country School with his first wife, Frances Dean Allen,[7] in 1907 and served as headmaster until 1949.
He also served as an American delegate to UNESCO conferences and held key posts in a number of educational organizations, including the Schoolmasters Association of the United States and the National Camp Directors Association.