The firm produced many of the city's Gilded Age buildings, including hotels, churches and residences.
His father “was a well-known piano-forte manufacturer and musician who helped to found the New York Philharmonic Society.
Pirsson received his training from an English architect named Weeler and was engaged in a very active practice before joining with Hubert in 1870.
In that year, the two men are listed as the architects for two third-class tenements erected on East 49th Street between First and Second Avenues under the first name Hubert & Pirsson.
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