ounded in 1876, Mount de Sales Academy is a Catholic, independent, college preparatory, co-educational school sponsored by the Sisters of Mercy. The story of the founding of MDS begins in Dublin where Catherine McAuley founded the Sisters of Mercy (est. 1831), an organization of religious women whose ministry was and is to educate and provide services for poor and disadvantaged youth and women.

Mount de Sales history is unique and spans post-Civil War Reconstruction, the invention of electricity, the arrival of the first automobiles, two World Wars, the Civil Rights Movement, Vietnam, the advent of space exploration, the assassination of President Kennedy, and 9/11. Through it all, Mount de Sales has been a beacon of light for so many.