The members of St. Agnes Parish, a Catholic church in Arlington, established the school in 1960.

[7] Local church leaders, including Boston Archbishop Sean Patrick O'Malley, were named as defendants in the lawsuit as well and were accused of being participants in the abuse cover-up.

[8] The principal was placed on administrative leave in 2016, pending the outcome of an investigation into an undisclosed incident.

[8] Separate allegations emerged in 2023—a teacher who had spent several years at the school and attained a position of power as head of the Mathematics program resigned due to "inappropriate conduct" with students.

[9] As of 2017[update] the school's athletic program has twenty-six sports which have varsity-level teams.