Charles Pierrepont Henry Gilbert (August 29, 1861 – October 25, 1952[1]) was an American architect of the late-19th and early-20th centuries best known for designing townhouses and mansions.

After being prepared for college he took courses in civil engineering and architecture, and later studied painting, sculpture, and the fine arts in general.

After college, he began practical work as an assistant in the office of a prominent firm of architects, where he received the training necessary to prepare him for engaging in his own business.

In 1886, at the age of twenty-five, Gilbert began practicing as an architect in New York City, and received commission to design buildings of all kinds.

[3] Another noteworthy building was the 1888 Richardsonian Romanesque mansion at Eighth Avenue and Carroll Street in Park Slope, Brooklyn for Thomas Adams Jr., a chewing gum magnate.

In education, client list and architectural style, Gilbert largely followed in the footsteps of Richard Morris Hunt, whose petit château on Fifth Avenue for William Kissam Vanderbilt set a model for French Late Gothic limestone châteaux to house the elite of the Gilded Age.

[5] Amongst Gilbert's clients were wealthy and influential industrialists and bankers such as Harry F. Sinclair, Joseph Raphael De Lamar, Felix M. Warburg, Otto H. Kahn, Adolph Lewisohn, Augustus G. Paine Jr. and families such as the Baches, Reids, Wertheims, Sloanes and other.