John Cameron Greenleaf

John Cameron Greenleaf, AIA, (June 2, 1878 – January 18, 1958), was an American architect based in New York City who practiced in the early 20th–century under his own name and as partner in the firm of Mills & Greenleaf.

Early life Greenleaf was born in Lenox, Massachusetts.

He attended Westminster School. He was also a Cup Man and was chairman of the Triennial Committee. Their offices were at 345 Fifth Avenue in New York City. They were referenced as among the associate architects attached to the new state prison erected in Peekskill, New York, located on an unusually high plateau overlooking the Hudson River.

In 1908, Mills & Greenleaf designed a Tudor Revival brick orphanage, the St. Marguerite's Home, in Mendham, New Jersey.

Mills & Greenleaf designed the Wedgewood, a mansion for August Cheney in Manchester, Connecticut which was completed in 1911.

Professional affiliations He was a charter member of Society of Beaux Arts Architects in New York City. 1913: Renovation of the Lenox Club, Lenox, Massachusetts 1916: 15 East 64th Street, a five-story fireproof residence for Helen C. Thorpe of 6 East 69th Street for the expected cost of $100,000 1919: 118 West 13th Street, a two-story brick laundry and infirmary for the Ladies' Christian Union of New York City for the expected cost of $31,000 1921: Additions to Wedgeway, the Austin Cheney residence, 99 Hartford Road, Manchester, Connecticut 1923: 8–10 West 37th Street, a ten-story brick store and loft building for a speculative development corporation for the expected cost of $$300,000. Residence for E. S. Mills in Hewlett, Long Island Residence for Marshall Prentiss in Litchfield, Connecticut