They believed that learning should be a natural and enjoyable activity related to the developmental stages and needs of the child.

During most of the 20th century, it was notable for being one of the most avant-garde, liberal and innovative schools in the province of Quebec, largely due to its child-centred philosophy (which was quite exceptional in the 1930s, and unique in Montreal).

The school's pedagogy is guided by its Founding Principles: (1) The child should have abundant opportunity for creative expression; (2) Adapt education to the differences of the individual child; (3) Health must come first; (4) Group-consciousness and social-mindedness should be developed; (5) Learning comes from doing; (6) The classroom should be freed from unnatural restraints.

[3] St. George's is a day school, however there is a family boarding program for international students.

Over the next few years enrollment grew exponentially, and the school was relocated to a series of residential buildings at the corner of Ramezay Avenue and The Boulevard, where the high school remains today.