Timothy F. Walsh was born in Cambridge, Massachusetts on November 8, 1868. He graduated from the Boston English High School in 1885. Walsh entered the office of Peabody & Stearns as an architectural student and, after promotion to the post of draftsman, remained in the employ of the firm for a decade. In 1894, he left for a year of advanced study in Paris ateliers, after which he spent a year abroad in travel before returning to the U.S. In 1898, Walsh went into partnership with Charles D. Maginnis and Matthew Sullivan to form Maginnis, Walsh and Sullivan. In 1906, Sullivan withdrew and the firm was renamed Maginnis & Walsh.
Walsh was a member of the Boston Society of Architects and President of the Boston Board of Appeals.
In 1899, Walsh married Marian Adams Wright (1865-1960), with whom he had four children: Kathleen, Margaret, James, and Edith. Walsh died on July 7, 1934, at the age of 66, in North Scituate, Massachusetts.
