Jan Borja died Saturday following a battle with cancer.
Borja retired last June after more than 40 years at New Trier High School on the North Shore.
In 2000, Borja became principal of the school's Northfield campus.
Colleagues describe her as the "heart and soul of New Trier."
New Trier is cancelling school Wednesday so staff and students can attend a funeral service, to be held at the Northfield campus.