Alexander Mackintosh (2 October 1861 — 1945) was an American architect and architectural designer active in New York City from the 1890s until his death.Birthdate cited on Mackintosh's 14 October 1903 naturalization petition. U.S. Naturalization Records Indexes, 1794-1995, accessed on ancestry.com on 16 November 2010Robert B. McKay, Anthony K. Baker, and Carol A. Traynor, Long Island Country Houses and Their Architects, 1860 — 1940 (W. W. Norton, 1997), page 270

Early life Macintosh was born in London, England to Alexander Mackintosh and his wife, the former Elizabeth Smith.Who's Who in New York City and State (L.R. Hamersly, 1918), page 701

Career According to Mackintosh's entry in the 1918 Who's Who in New York City and State, he worked for various British architects between 1878 and 1892 and won several architectural prizes, including the Sir William Tite's Prize from the Royal Institute of British Architects in 1891.Who's Who in New York City and State (L.R. Hamersly, 1918), page 701 Mackintosh worked for prominent British architect Sir Aston Webb before immigrating to the United States in January 1893.Birthplace cited in Who's Who in New York City and State (L.R. Hamersly, 1918), page 701Arrival in U.S. cited in Mackintosh's 14 October 1903 naturalization form. U.S. Naturalization Records Indexes, 1794-1995, accessed on ancestry.com on 16 November 2010Robert B. McKay, Anthony K. Baker, and Carol A. Traynor, Long Island Country Houses and Their Architects, 1860 — 1940 (W. W. Norton, 1997), page 270. This book states Macintosh relocated to New York in 1896, but in his subsequent lawsuit against the Manhattan firm Kimball & Thompson Mackintosh states he was hired by them in 1893.

After moving to the United States, he worked for Kimball & Thompson, a New York City firm, from 1893 until it disbanded in 1898, and then opened his own business. Among the Kimball & Thompson projects on which Mackintosh worked were a French Renaissance Revival mansion for Gertrude Rhinelander Waldo (1898); alterations to the B. Altman department store (1896); and the Empire Building (1895).Christopher Gray, "Streetscapes: From a Mysterious Mansion to a Ralph Lauren Store", The New York Times, 7 Oct 2010."Mackintosh vs. Thompson et al.", New York Supplement, Volume 68, National Reporter System, New York (State). Superior Court (New York), New York (State) Court of Appeals, New York (State) Supreme Court (West Publishing Company, 1901), pages 492-495

Works as Alexander Mackintosh As head of his own firm, Mackintosh's projects included: Kearny Town Hall, Kearny, New Jersey Coit Building, Paterson, New JerseyWho's Who in New York City and State (L. R. Hamersly, 1918), page 701 L'Enfant Building, Paterson, New JerseyWho's Who in New York City and State (L. R. Hamersly, 1918), page 701 All Angels Church, Twilight Park, Haines Falls, New York (1910)"Churches for Small Congregations", The Architectural Record, Volume 27, page 170 An unbuilt plan for the Brooklyn County Courthouse (1910)Brooklyn Divided on Court House Site", The New York Times, 19 February 1910 North Side Bank, 225-227 Havemeyer Street, Brooklyn, New York (1913)The Brooklyn Daily Eagle Almanac, 1913, page 436 Underhill House, the Oyster Bay, New York, estate of John Slade (circa 1918)Robert B. McKay, Anthony K. Baker, and Carol A. Traynor, Long Island Country Houses and Their Architects, 1860 — 1940 (W. W. Norton, 1997), page 270 The Mountain Country Club, Twilight Park, Haines Falls, New York (1932)"Clubhouse at Twilight Park, N. Y.", The New York Times, 12 June 1932

Personal life Mackintosh became a naturalized American citizen on or about 14 October 1903.Date cited on Mackintosh's naturalization petition. U.S. Naturalization Records Indexes, 1794-1995, accessed on ancestry.com on 16 November 2010 Mackintosh married Jeannette Eliza Day, daughter of Augustus P. Day of Brooklyn, New York, on 6 December 1911.Wife's name and wedding date cited in "Society — City Social Notes", The New York Times, 19 November 1911Wife's maiden name, father-in-law's name, and location cited in U. S. Federal Census for Brooklyn, New York, 1920, access on ancestry.com on 16 November 2010 They had one child, Alexander Day Mackintosh (1912 — 1989).U. S. Federal Census for Long Branch, New Jersey, 1930, accessed on ancestry.com on 16 November 2010,

Alexander Mackintosh died at his home in Long Branch, New Jersey, on August 2, 1945, at age 83.

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