Both architects of Boston, Mass., active there from 1906 to 1934. The partnership consisted of Charles Donah McGinnis (1867-1955), and Timothy Francis Walsh (1868-1934). In the United States, their best known work is that of the Basilica of the National Shrine of the Immaculate Conception in Washington, D.C. (begun 1920; completed 1959), the largest Roman Catholic Cathedral in the country.