[3] Eaglebrook School was founded in 1922 by Howard Gibbs, a friend of Headmaster Frank Boyden of Deerfield Academy.

Thurston Chase, an Eaglebrook teacher and Williams College graduate, took over the school after Gibbs' unexpected death.

Student enrollment was expanded, and the school grew to include a gymnasium, tennis courts, a learning center, a science building, and four new dormitories.

The school continued to grow as it bought 500 adjacent acres and added new playing fields, a track, a ski area with snow making and chair lift, a swimming pool, and two new dormitories.

The Schwab Family Pool, and the McFadden Rink at Alfond Arena and a new track and field facility were built in the late 1990s.