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
