Mary was born in Boston and grew up in South Boston. After graduating from Cardinal Cushing High School in 1958, she attended secretarial school, which enabled her to get a position working for the MBTA. In 1966 Mary married Frank Conroy and together they raised 3 daughters. Mary & Frank moved to Randolph in 1967 and became parishioners of St. Mary Parish. After taking time off to raise her family Mary took on a position as a school bus driver for Blue Hills Regional Vocational Technical High School. After working in this position for 30+ years Mary retired and became a volunteer at St. Mary Parish which turned into a part-time position.