[1] Eno, a member of the circle of Mary Seney Sheldon, built the Fifth Avenue Building on the site of his grandfather's Fifth Avenue Hotel facing Madison Square; an unpaid researcher at Princeton University with the courtesy title of "Professor", he was better known as a psychologist, author and poet.

The nephew claimed he needed the money for the education of his children, Amos and Alice.

Completed in 1924, it was described at the time as "The first laboratory in this country, if not in the world, dedicated solely to the teaching and investigation of scientific psychology.

[7][c] The couple rented one of England's finest Elizabethan mansions, Montacute House in Somerset.

[9] Eno's widow Flora married, on August 1, 1931, (Ernest) Rupert Bertram Ogilvy Freeman-Mitford, son of Bertram Freeman-Mitford, 1st Baron Redesdale, and became the mother of the 5th Baron Redesdale.