SOCIETÀ PER LE MISSIONI ESTERE DEGLI STATI UNITI D'AMERICA (di MARYKNOLL). — Founded on 27 April 1911 by the episcopate of the United States of America and authorized by Bl. Pio X on 29 June of the same year.
The co-founders were Fr. Giacomo A. Walsh (1867–1936), who later became titular bishop of Sion and the Society’s first superior general, and Fr. Tommaso F. Price (1860–1919). They began the work at Hawthorne (New York) and on 18 September 1912 moved to Ossining (New York), which they called Maryknoll.
The Society received the decree of praise on 15 July 1915. In 1917 the first missionaries departed for China. The missionaries are now found in Africa, China, Japan, Korea, the Philippines, Bolivia, Chile, and Peru. The Constitutions were definitively approved on 7 May 1939. The members number 477 priests, 81 clerics, and 86 brothers.