Architect, artist, muralist, set designer, pageant designer. Hewlett was born into an old Long Island family at Rock Hall in Lawrence, NY. He is descended from a long line of Hewletts for which the town of Hewlett is named. (Built in 1767, Rock Hall is a lovely example of Georgian architecture and is now a museum.) Hewlett was graduated from Columbia University in 1890. After a year of study at the Ecole des Beaux-Arts in Paris, he joined the famous architectural firm of McKim, Mead, and White. In 1894 he founded the NY architectural firm of Lord and Hewlett. The firm designed many notable buildings including, Brooklyn Hospital (1920), Danbury Connecticut Hospital, St. John's Hospital, Brooklyn, and the Brooklyn Masonic Temple (1907). The firm also designed the famously extravagant 147 room mansion at 980 Fifth Avenue for Montana's Senator and "copper king", William A. Clark. They designed private homes as well; many of them in Somerset County, NJ and on Long Island. A house designed in 1910 for E. S. Harkness in New London, Conn., still stands in Harkness Memorial State Park. A mural and set designer as well as an architect, Hewlett painted murals for the Willard Straight Memorial Hall at Cornell University; for the Elihu Root Auditorium at The Carnegie Institution at Washington, D.C.; the eight historical murals for the Bank of New York and Trust Company building at 48 Wall Street, now the Museum of American Finance; the four huge murals in the Veterans' Memorial Hall at the Bronx County Courthouse; five murals for the Providence National Bank, Providence, R.I.; and ten murals for the Hudson City Savings Bank in Newark, N.J., now the National Newark Building. He also designed the Sky Mural at Grand Central Station. He designed sets for several plays staring Maude Adams, including Chanteclere and Peter Pan, and the set for Eugene O'Neill's Pulitzer Prize winning play Beyond the Horizon. He also designed sets and costumes for the Metropolitan Opera's 1916 production of Iphigenie en Tauride. Hewlett designed pageants such as the 1923 AIA Gold Medal Award ceremony in Washington, D.C. honoring Henry Bacon designer of the Lincoln Memorial. In 1970, the Gold Medal was awarded to his son-in-law and fellow polymath, Buckminster Fuller, who was married to his oldest child Anne. Hewlett was involved with other famous artists in the decorations for Fifth Avenue called "The Avenue of the Allies" which welcomed the English and French War Commission in 1917. And for many years he collaborated on the decorations for the fabulous Beaux-Arts Balls held at the Hotel Astor. Hewlett was president of the Architectural League of New York, 1919-1921; president of the National Society of Mural Painters, 1921-1926; and vice-president of the American Institute of Architects, 1928-1930. He was also a member of the National Academy of Design. In 1932, Hewlett was appointed resident director of the American Academy in Rome- the favorite project of Charles McKim, his old boss at MM&W.