Mallon's documented background centers on her education in Massachusetts, where she trained before entering legal practice in the state. Her undergraduate studies took place at the University of Massachusetts Amherst, a public institution in western Massachusetts that had developed from a land-grant agricultural college founded in 1863.
Her legal education took place in Newton, a city adjacent to Boston, at Boston College Law School.
Mallon earned a Bachelor of Arts from the University of Massachusetts Amherst in 1980. The institution was founded in 1863 as the Massachusetts Agricultural College under the Morrill Land-Grant Colleges Act, which funded colleges of agriculture and mechanical arts across the United States. It was renamed Massachusetts State College in 1931 and became the University of Massachusetts in 1947, so it already bore that name when she attended.
Mallon then studied at Boston College Law School, where she received a Juris Doctor in 1989. The law school was founded in 1929 as Boston College's first graduate program and received American Bar Association accreditation in 1932. It found its permanent home on the Newton campus in the early 1970s, which is where Mallon's legal studies took place.
Her admission to the Massachusetts bar in 1989 came in the same year she completed her law degree. Admission to practice in Massachusetts is granted by the Supreme Judicial Court, the Commonwealth's highest appellate court, after the Board of Bar Examiners evaluates petitioners' qualifications, character, and fitness.
Mallon's documented professional life is in the law. She was admitted to the Massachusetts bar in 1989, which authorized her to practice law in the Commonwealth's courts.
She later worked as a partner in a firm identified as S Eggeuno. Her career in private legal practice therefore followed her admission to the bar, although the dates and details of her work at the firm are not documented.
