February 6, 1857|
Brooklyn, New York
|Died||April 10, 1947
New York City
|Alma mater||École des Beaux-Arts|
Corcoran Gallery of Art
Charles Scribner's Sons Building
|Projects||United States Naval Academy|
|This section needs additional citations for verification. (March 2013)|
Flagg was born in Brooklyn, New York. His father Jared Bradley Flagg was an Episcopal priest and a notable painter. Ernest left school at 15 to work as an office boy on Wall Street. After working with his father and brothers in real estate for a few years, he designed duplex apartment plans in 1880 with the architect Philip Gengembre Hubert, for the co-operative apartment buildings Hubert was known for.
Cornelius Vanderbilt II, Flagg's cousin through his marriage to Alice Claypoole Gwynne,[unreliable source] was impressed by Flagg's work and sent him to study at the École des Beaux-Arts in Paris from 1889–1891, under his patronage. In 1891, Flagg began his architectural practice in New York, greatly influenced by his knowledge of the French ideas of architectural design, such as structural rationalism.
During this time he joined with John Prentiss Benson to create Flagg & Benson, which later became Flagg, Benson & Brockway with the addition of Albert Leverett Brockway. FB&B designed St. Luke's Hospital in New York City.
In 1894, he established the architectural firm of Flagg & Chambers with Walter B. Chambers, whom he met in Paris. Usually, Flagg alone credited for some of the work he and Chambers worked on together, such as the Corcoran Gallery of Art.
His contributions to zoning and height regulations were essential to New York's first laws governing this aspect of the city's architecture. Flagg argued in favor of zoning laws which would regulate the height and setback of buildings, to allow light and air to reach the streets below them. He was a president of the New York Society of Beaux-Arts Architects. A small collection of Flagg's personal and professional papers is held in the Department of Drawings & Archives at Avery Architectural and Fine Arts Library at Columbia University.
Ernest Flagg married Margaret E. Bonnell on June 27, 1899 in New York City. They had one daughter, Betsey Flagg, who married John Melcher[unreliable source] and become a well-respected small-scale portrait painter.
In 1912, Mr. and Mrs. Ernest Flagg were on their way to a party held by Stowe Phelps, a fellow architect, when their limousine struck and killed a boy (James McNamara) who had suddenly skated in front of the car. The couple drove the boy to the hospital but he died en route.
- Scribner Building, New York City, 1893
- Unused plan for the Washington State Capitol at Olympia, Washington, 1893
- Gov. Samuel J. Tilden Monument, New Lebanon, New York, 1895–1896
- St. Nicholas Skating Rink, 69 West 66th Street, New York – 1896 
- St. Luke's Hospital, New York City, 1896
- Mills House No. 1 / Greenwich Hotel, New York City, 1896
- Mills House No. 2, New York City, 1897
- Corcoran Gallery of Art, Washington, D.C., 1897
- Indian Neck Hall, estate of Frederick Gilbert Bourne, Oakdale, New York, 1897
- Engine Co. No. 33, New York City, 1898
- Ernest Flagg residence, gatehouse and gate, Staten Island, New York, 1900
- Cherokee Apartments, New York City, 1900
- Armenian General Benevolent Union of America, New York City, c. 1900
- Charlesbank Apartments, Boston, Massachusetts, c. 1900, demolished c. 1960
- Sheldon Library (now admissions office), St. Paul's School, Concord, New Hampshire, 1901
- Lawrence Library, Pepperell, Massachusetts, 1901
- Regency Whist Club, New York City, 1904
- The Towers, a "castle" on Dark Island, St. Lawrence Seaway, 1905
- Buildings at the United States Naval Academy, Annapolis, Maryland, including Bancroft Hall (1901–1906), the Naval Academy Chapel (1908), Mahan Hall, Maury Hall, Sampson Hall, and the Superintendent's residence
- Clark Memorial Chapel, School House and Brick Dorms, Pomfret School, Pomfret, Connecticut, 1907
- "Little" Singer Building, New York City, 1907
- Singer Building, New York City, 1908, demolished 1968
- Charles Scribner Residence, later Polish Delegation to the United Nations, New York City, 1912
- Charles Scribner's Sons Building, New York City, 1913
- Merrill House, Vinegar Hill Historic District, Bloomington, Indiana, 1928
- Celtic Park apartments, Queens, New York, 1930
- Flagg Court housing development, Brooklyn, New York, 1933–36
- Small Houses: Their Economic Design and Construction (1922)
- Le Naos du Parthenon (1928)
- Ernest Flagg - Beaux-Arts Architect and Urban Reformer The MIT Press
- Flagg, Ernest. Genealogical Notes on the Founding of New England: My Ancestors Part in that Undertaking. Hartford, Conn., 1926, p. 135.
- Flagg, Lucius C.S. Family Records of the Descendants of Gershom Flagg. Quincy, Ill., 1907, pp. 125, 128.
- Eighth Generation Descendants of Bartholomew Flegg
- Albert L Brockway
- Fire Engine Co. 67 Landmarks Preservation Commission
- Flagg Genealogy Descendants of Bartholomew Flegg - Ninth Generation.
- Betsey Flagg Melcher Luce Foundation Center for American Art.
- "BOY SKATER KILLED BY DINERS' AUTO; Mr. and Mrs. Ernest Flagg's Car Runs Down Lad at Stowe Phelps's Door." New York Times, February 24, 1912.
- White, Norval; Willensky, Elliot; Leadon, Fran, AIA Guide to New York City, Oxford University Press, 2010. Cf. p.358.
- "STREETSCAPES: A Skating Rink/Boxing Ring, And a Wild and Crazy Facade", The New York Times, February 6, 2005
- "Bulging Buildings: Cantilevers Make a Comeback". New York Sun. July 3, 2008. Retrieved 2008-07-25. "In 1908, Ernest Flagg designed one of Lower Manhattan's most distinctive skyscrapers for the Singer Manufacturing Company, at Broadway and Liberty Street ..."
- Vinegar Hill Historic District (105-055-77001-77061). City of Bloomington: Bloomington Historic Preservation Commission, n.d. Accessed 2011-01-27.
- Plunz, Richard. A History of Housing in New York City. Columbia University Press, New York: 1990. P. 213-214.
- Flagg, Ernest - Genealogical Notes of the Founding of New England: My Ancestors Part in that Undertaking Lockwood & Brainard Co. (1926) ISBN 0-8063-0533-9
- Mardges Bacon, Ernest Flagg: Beaux-Arts Architect and Urban Reformer, MIT Press (1986)
- Paul Malo, "Boldt Castle", Laurentian Press (2001)
- Paul Malo, "Fools' Paradise", Laurentian Press (2003)
- Ernest Flagg at NYC Architecture
- Ernest Flagg at MIT Press
- Ernest Flagg information at Structurae
- Buildings by Ernest Flagg at the Library of Congress's Historic American Buildings Survey database