Founded in 1949, St. Mary's High School is a Roman Catholic, Parochial, coeducational, college preparatory school serving the diverse educational needs of families in the Diocese of Rockville Centre and the Diocese of Brooklyn. St. Mary's High School is conducted by dedicated Lay and Religious men and women who value their ties to the Sisters, Servants of the Immaculate Heart of Mary, and the Marist Brothers and continue their commitment to preparing young men and women for college and life-long learning. While celebrating the uniqueness of each individual, our mission calls us to continue our tradition of spiritual development, academic excellence, friendship, service, responsibility, and citizenship into the twenty-first century.