From 1861 to 1952 Chestnut Hill Academy was an all-male Pre-K through 8th grade independent college preparatory school located in Northwest Philadelphia. In the Fall of 1952 it added the 9th grade; in 1953 the 10th; in 1954 the 11th; and in 1955 the 12th, with the first High School graduating class in the Spring of 1956. In 2011 CHA merged with its academic partner and neighbor, the all-girls school Springside School.