Whitney Warren (January 29, 1864 - January 24, 1943) was an American  Beaux-Arts architect who founded, with Charles Delevan Wetmore, Warren and Wetmore in New York City, one of the most prolific and successful architectural practices in America.
Warren was born in
New York City on January 29, 1864. He was one of nine children born to George Henry Warren I (1823-1892) and Mary Caroline ( née Phoenix) Warren (1832-1901). His siblings included  Lloyd Warren, who was also an architect, and  George Henry Warren II, a stockbroker who was the father of  Constance Whitney Warren. He was a cousin of the  Goelets and [a] Vanderbilts and the grandson of [b] U.S. Representative Jonas Phillips Phoenix.  [c]
In 1883, he enrolled at
Columbia University to study architecture, but only stayed for one year. From 1884 until 1894, Warren spent ten years at the  École des Beaux-Arts in Paris. There he studied under Honoré Daumet and Charles Girault, and met fellow architecture student  Emmanuel Louis Masqueray, who would, in 1897, join the Warren and Wetmore firm. 
Warren returned to New York in 1894, and began practicing as an architect.
One of his first clients was the lawyer  Charles Delevan Wetmore. After their successful collaboration, Warren convinced Wetmore to become his partner and they organized Warren and Wetmore with Warren as the architect and Wetmore responsible for the business side of the firm. 
World War I, Warren was involved in organizing the Comité des Étudiants Américains de l'École des Beaux-Arts Paris; a student-run charity in support of the French cause. He also supported actively the claims of Italy in the Adriatic, during and after the war. He was an intimate friend of Gabriele d'Annunzio, and was appointed diplomatic representative in the United States of the "Free State of Fiume". He was the author of Les Justes Revendications de l'Italie: la Question de Trente, de Trieste et de l'Adriatique. Many of his addresses, delivered 1914-1919, were published and widely distributed. 
Warren retired in 1931, but occasionally served as consultant. Warren took particular pride in his design of the new library building of the
Catholic University of Leuven, which was finished in 1928. The library was severely damaged by British and German forces during World War II, but was completely restored after the war. 
Two of the firm's major works were the
construction of Grand Central Terminal and of the Biltmore Hotel, both in New York City. 
In 1884, Warren was married to
Charlotte Augusta Tooker (1864-1951) in  Newport, Rhode Island. Charlotte was the eldest daughter of  Gabriel Mead Tooker, a prominent New York lawyer and member of Mrs. Astor's famous Four Hundred. Together, they are the parents of:   Charlotte Augusta Warren (1885-1957), who married William Greenough in 1907.
 Gabrielle Warren (1895-1971),
who married Reginald Bulkeley Rives (1890-1957),  a nephew of  George Rives and Edward Bulkeley, in 1917.   Whitney Warren Jr. (1898-1986),  who was a  horticulturalist and patron of the arts.  Warren Jr. was referred to as "an overly rich bachelor operating in San Francisco"  who traveled around the world.  
In 1927, Warren and his brother George each inherited $2,314,143 from the estate of their uncle, Lloyd Phoenix.
Warren died after a nine-week illness on January 24, 1943 at
New York Hospital in New York City. At the time of his death, Warren resided at 280 Park Avenue in New York City and was a member of the  Knickerbocker Club, the Racquet and Tennis Club, and the Church and South Side Sportsmen's Clubs. After a service at  St. Thomas Church, Fifth Avenue, he was buried at Island Cemetery in Newport. His widow died in 1951 and was buried alongside him in Newport.  
In 1917, Warren received the
Medal of Honor from the American Institute of Architects for the firm's work.
Works by Warren are found in the collection of the
Cooper-Hewitt, National Design Museum. 
^ His sister Harriette Louise Warren (1854-1912) was married to
Robert Goelet and was the mother of Robert Walton Goelet (1880-1941). 
^ His relative, Lucy Warren (1853-1894), was married to Benjamin Kissam (1818-1891), the brother of Maria (née Kissam) Vanderbilt (1821-1896), wife of
William Henry Vanderbilt and mother of William, Cornelius, Margaret, Emily, Florence, Frederick, Eliza, and George Washington Vanderbilt II.
^ Warren's paternal grandfather Nathan Warren (1777-1834) was the brother of Stephan Warren (1783-1847), father of
Joseph M. Warren (1813-1896), a U.S. Representative from New York. 
^ a b c d
"WHITNEY WARREN, ARCHITECT, 78, DIES; Designer of the Grand Central Terminal and Rebuilding of Louvain Library, Belgium HAD PRACTICAL APPROACH Specialized With His Partner, C. D. Wetrnore. in Railroad Structures, Hotels, Offices". . January 25, 1943. p. 13 The New York Times . Retrieved 2018.
"George Henry Warren" (PDF). . April 9, 1892 New York Times . Retrieved . George Henry Warren, for many years one of the best-known financial men in New York died yesterday at his home, 520 Fifth Avenue, of a complication of diseases, ...
"Sleep-Walk Plunge Kills Lloyd Warren; Famous Architect Falls From His Sixth-Floor Apartment in Early Morning. Suicide Theory Discarded. Victim Had Suffered From Somnambulism. Created BeauxArts Institute". . October 26, 1922 New York Times . Retrieved . Lloyd Warren, architect, was found dead yesterday morning in an areaway below his bedroom at 1 West Sixtyfourth Street. It is believed that he fell accidentally while opening the window of his apartment, which is on the eighth floor. Mr. Warren who was founder of the Beaux-Arts Institute of Design, and a brother of Whitney Warren, the architect, ... Subject to Sleep-Walking. Not a Suicide, Says Doctor.
Weeks, Lyman Horace (1898). . Historical Company. p. 604 Prominent Families of New York: Being an Account in Biographical Form of Individuals and Families Distinguished as Representatives of the Social, Professional and Civic Life of New York City . Retrieved 2018.
"George H. Warren ... A Founder of Concern That Once Owned Metropolitan Opera's Home, Dies at 87. Kin Of Noted Architect. Graduate of Columbia and Its Law School, but Never Had Practiced. Formerly Broker". . June 4, 1943 New York Times . Retrieved . Warren's wife, Georgia ... Warren, died on Feb. 21, 1937. Surviving are a son, George Henry Warren, Jr.; a daughter, Constance Whitney Warren, ...
^ a b
"MISS WARREN A BRIDE. Daughter of Mr. and Mrs. Whitney Warren Weds William Greenough" (PDF). . December 27, 1907 The New York Times . Retrieved 2018.
"PHOENIX, Jonas Phillips - Biographical Information". bioguide.congress.gov. Biographical Directory of the United States Congress . Retrieved 2018.
. Lewis Historical Publishing Company. 1915. p. 357 Genealogies of the State of New York: A Record of the Achievements of Her People in the Making of a Commonwealth and the Founding of a Nation . Retrieved 2018.
"Warren and Wetmore: Architects of the Vanderbilt". www.vanderbiltmuseum.org. Vanderbilt Museum . Retrieved 2018.
^ a b
Chisholm, Hugh, ed. (1922). . (12th ed.). London & New York. Encyclopædia Britannica
^ a b c
"Warren, Whitney, 1864-1943. Whitney Warren papers, 1914-1926: Guide". oasis.lib.harvard.edu. Houghton Library, Harvard Library, Harvard University . Retrieved 2018.
^ a b
"Warren & Wetmore architectural drawings and photographs, 1889-1938". www.columbia.edu. Avery Architectural and Fine Arts Library, Columbia University . Retrieved 2018.
^ a b
"MRS. WARREN DIES; ARCHITECT'S WIDOW; Leader in French Relief Work During First World War-- Set Up Secours National" (PDF). . September 13, 1951 The New York Times . Retrieved 2018.
^ a b
"A WEDDING IN NEWPORT | MR. WHITNEY WARREN, OF NEW-YORK, AND MISS TOOKER.FASHIONABLE SOCIETY WELL REPRESENTED--THE TOILETS OF THE LADIES--THE PRESENTS AND THE BRIDE'S HOUSE" (PDF). . July 18, 1884 The New York Times . Retrieved 2018.
Boughton, James (1890). . J. Munsell's Sons. p. 15 Bouton--Boughton Family: Descendants of John Boution, a Native of France, who Embarked from Gravesend, Eng., and Landed at Boston in December, 1635, and Settled at Norwalk, Ct . Retrieved 2018.
"Obituary 1 -- No Title". . July 31, 1971 The New York Times . Retrieved 2018.
"GUEST ON YACHT KILLED BY MAST; Reginald Rives of Newport Was a Retired Air Officer and Stock Broker Here Retired Stock Broker" (PDF). . July 1, 1957 The New York Times . Retrieved 2018.
. Princeton Alumni Weekly Princeton Alumni Weekly. 1957. p. 33 . Retrieved 2018.
"REGINALD B. RIVES WEDS MISS WARREN Younger Daughter of Mr. and Mrs. Whitney Warren a Bride in St. Thomas's Chapel. CEREMONY AMID ROSES Many Prominent in Society Among the Guests -Reception Held In Ballroom of the Ritz" (PDF). . February 4, 1917 The New York Times . Retrieved 2018.
"Philanthropist Whitney Warren dies at age 88". . 13 Jan 1986. p. 12 Santa Cruz Sentinel . Retrieved 2018.
^ a b
Beaton, Cecil (2007). . Knopf Doubleday Publishing Group. p. 421. The Unexpurgated Beaton: The Cecil Beaton Diaries as He Wrote Them, 1970-1980 ISBN 9780307429520 . Retrieved 2018.
Miller, Paul (2010). . Applewood Books. p. 64. Lost Newport: Vanished Cottages of the Resort Era ISBN 9781429091121 . Retrieved 2018.
Hanks, Tara (March 3, 2016). Born On This Day: Whitney Warren Jr. 1898-1986 . Retrieved 2018.
"WHITNEY WARREN JR. SAILS.; Leaves for 35,000-Mile Tour, Which Will Include South Seas". . January 9, 1924 The New York Times . Retrieved 2018.
"LEADING ARCHITECTS AT WARREN FUNERAL; Rites for Noted Designer Are Held in St. Thomas Church" (PDF). . January 27, 1943 The New York Times . Retrieved 2018.
Whitney Warren | People | Collection of Smithsonian Cooper-Hewitt, National Design Museum