John Nicholas Brown was born on December 17, 1861 to John Carter Brown II and Sophia Augusta Brown. His father was a collector of American books in the mid-19th century and was the first American to join the Hakluyt Society as a charter member in 1846, and in 1855, he was elected a member of the American Antiquarian Society. His brother was Harold Brown and his sister was Sophia Augusta Brown, who married William Watts Sherman. In 1881, Brown entered Brown University, however, he left school two years, citing poor health and a weak constitution. He continued his studies of his own accord, traveling extensively and studying history, architecture, languages and the classics. In 1895, the faculty of Brown University voted to confer a degree upon him as a member of the class of 1885.
After receiving his degree from Brown University, Brown began to work for the family business, Brown & Ives, with the assistance of his cousin William Goddard. He also served as President of the Lonsdale Company, and in 1888, Brown and his brother, Harold, formed a partnership, "J.N. & H. Brown." The brother's business was similar to the activities of the family business where they lent funds for mortgages and invested in buildings and lands out west. In their business dealings, John and Harold relied upon George W. R. Matteson, the trustee of their father's estate for advice and assistance.
Brown died on May 1, 1900, when his son was only three months old. His brother Harold Brown died a few days later after returning to the United States from Europe after hearing of his brother's death. John Nicholas Brown II was referred to as the richest child in the world at the time. In 1901, his widow donated the funds to build Emmanual Episcopal Church in Newport, RI in his memory. She died at her home, Harbor Court, in 1950.
Organizations and philanthropy
Brown was a member of the Rhode Island Society of the Cincinnati and the New York Society of Colonial Wars. He was elected a member of the American Antiquarian Society in 1888. On February 1, 1890 Brown became a charter member of the Rhode Island Society of the Sons of the American Revolution. He was elected as the Society's second president and served May 29, 1890 until May 29, 1891. Ironically, according to the Rhode Island Society's manual published in 1900, Brown "never qualified as a member of the Society, nor officiated as president." This was because he never completed a formal membership application to join the Society despite having ancestors who supported the cause of American independence. Brown was the donor of the Providence Public Library building in Providence, RI.