(b Brooklyn, NY, 6 Feb 1857; d New York, 10 April 1947). American architect. He had no formal architectural education in the USA and spent his early career in partnership with his father and brother, engaged in land and building speculation in New York. This experience led Flagg's cousin, Cornelius Vanderbilt II, to provide financial support for his education at the Ecole des Beaux-Arts in Paris (1888-90). There he studied in the atelier of Paul Blondel and was joined by Walter B. Chambers (1866-1945), with whom he travelled and later formed a loosely structured partnership.

See the Abbreviations for further details.

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