[1] In 1893, the year his father died, Nelson was boarding at St. Paul's School, Concord, New Hampshire.
[4] In 1903, Nelson won a McKim Fellowship of $900, administered by Columbia University, for travel abroad.
[5] Beginning about 1905, Nelson taught architectural design at Columbia University, remaining on the faculty until at least 1917.
During the same period, he practiced architecture in partnership with Hubert Van Wagenen, a Columbia graduate of the class of 1899.
In 1920, Nelson's office was located at 15 West 38th Street, New York City,[6] but by 1915 he was living in Upper Montclair, New Jersey, where about 1916 he built a house for himself and his family at 303 Highland Avenue.