The following excerpt was published in "Assembly Biographies: Mary M. Lilly " New York Red Book. (1919): 158-9.
"Mrs. Mary M. Lilly, Democrat, represents Seventh Assembly District in the borough of Manhattan, city of New York. Mrs. Lilly has lived all her life in this district. She is a graduate of Hunter College and of the New York University. She was for a number of years a teacher and a supervising officer in the public schools of the city of New York.
She is a practicing lawyer, having been one of the first women admitted to the practice of law in the State of New York, and received the first scholarship given by the New York University to a woman. She was at the time of her election Recording Secretary of the City Federation of Women's Clubs. She is President of the Knickerbocker Civic League and Vice-President of the Society for the Aid of Mental Defectives. She is a member of the Catholic Big Sisters and of the New Yorkers Club, the Amsterdam Democratic Club, and all of the women's Democratic organizations of New York city.
Her law offices are at 1947 Broadway, New York. She is the first woman elected to an elective office of any kind by the city of New York and is serving her first term in the Legislature.
She is a widow; her son, Major J. Joseph Lilly, was at the time of her election the Trial Judge Advocate of Camp Dix, and had been serving in the United States Army from the beginning of the outbreak in Mexico."