Finding that he had a greater interest in art and culture, Shepherd returned to graduate school and earned a master's in art history. He taught that subject at the University of Florida. In order to be in a hub of art activity in New York City, he moved in 1972 to Staten Island, where for a time he painted full-time. He became interested in Staten Island's history, and architectural history in particular, and began to publish works on the latter topic. He obtained employment at the Staten Island Museum with a specialization in architectural history. There he created an exhibition on Staten Island architecture and led walking tours.
Historic preservation
Realizing the need for a historic preservation organization on Staten Island, and finding that there was none, Shepherd together with others founded the Preservation League of Staten Island in 1977. He was its president until 1981, and its executive director from 2012 to 2017. He was instrumental in preserving and promoting the Snug Harbor Cultural Center & Botanical Garden and the St. Paul’s Avenue-Stapleton Heights Historic District. He was executive director and chief executive of Historic Richmond Town from 1981 to 2000. There he oversaw the preservation of multiple properties.
Gibson, David; Shepherd, Barnett; Bauer, Steven (1979). Sailors' Snug Harbor: an Historic Structures Report. New York: Snug Harbor Cultural Center. LCCN79127544.
Shepherd, Barnett (1979). Sailors' Snug Harbor, 1801-1976. New York: Snug Harbor Cultural Center. LCCN79016979.
Shepherd, Barnett (1979). A Staten Island Ferry Rider's Guide to the Sights of Upper New York Bay (Map). Staten Island, New York?: Barnett Shepherd?.
Shepherd, Barnett (1980). Inventory of Architectural Drawings in the Collection of the Staten Island Historical Society. Staten Island, New York: Staten Island Historical Society.
Shepherd, Barnett (1999). "Randall, Robert Richard". American National Biography Online. Oxford: Oxford University Press.
Mosley, Lois A. H.; Shepherd, Barnett (2003). Sandy Ground Memories. Staten Island, New York: Staten Island Historical Society. ISBN9780960675654.
Salmon, Patricia M.; Shepherd, Barnett (2008). The Staten Island Ferry: A History. Staten Island, New York: Staten Island Museum. ISBN9780971226722.
Shepherd, Barnett (2008). Tottenville: the Town the Oyster Built: a Staten Island Community, its People, Industry and Architecture (1sted.). Staten Island, New York: Preservation League of Staten Island. ISBN9780615264349. LCCN2008910997.
Shepherd, Barnett (March 30, 2012). "The Reminiscences of Barnett Shepherd"(PDF). New York Preservation Archive Project (Interview). Interviewed by Juselius, Elin. Retrieved September 13, 2025.
Shepherd, Barnett (2013). Staten Island Scenery: Paintings, Prints, Drawings and Photographs, 1679-1900. Staten Island, New York: The Staten Island Historical Society. ISBN9780960675623. LCCN2013952669.
Personal life
Shepherd was openly gay. He married his longtime partner, Nick Dowen, in October 2024. They lived in the Judge Jacob Tysen House, built in 1834, on Staten Island.
Death
Shepherd died on August 16, 2025, on Staten Island, at age 87.
123Shepherd, Barnett (March 30, 2012). "The Reminiscences of Barnett Shepherd"(PDF). New York Preservation Archive Project (Interview). Interviewed by Juselius, Elin. Retrieved September 13, 2025.