James "Monroe" Hewlett (August 1, 1868 – October 18, 1941)[1] was an American Beaux Arts architect, scenic designer, and muralist.

During his time at Columbia, Hewlett studied architecture under William Robert Ware and was captain of the varsity football team.

After a year of study at the École des Beaux-Arts in Paris, he joined the prestigious architectural firm of McKim, Mead & White, where he met his future business partner Austin W. Lord.

James Monroe Hewlett was the father-in-law of Buckminster Fuller[2] and is credited with the creation of the mural of the heavens on the ceiling of Grand Central Terminal in New York City.

[4] A mural at the Bronx County Courthouse depicting Jonas Bronck's arrival was created in the early 1930s.