Shortly after they moved in, however, the farming community of Branchville began a gradual transformation into a suburban residential area. Soon, a large portion of Weir's original land, including a fishing pond he had built with $2,500 first prize money he had won for a painting, was at risk to be developed. Their next-door neighbor, J. Alden Weir's daughter Cora Weir Burlingham, reportedly inspired Doris to become a preservation activist with a simple question: "Doris, don't you think you can save the pond?" She, along with her husband Sperry, acted. They organized and spearheaded a grassroots preservation movement, passing out pins to the community that read “Weir Lives” and “Save the Farm.” These, and other efforts, ultimately led to saving much of Weir’s original property. In 1990, the saved sixty-acres became part of the national park service system, as Weir Farm National Historic Site. Sperry and Doris Andrews were granted life tenancy on the property, and they would often give impromptu tours of the studios to curious visitors.
Throughout his residency at Weir Farm, Andrews embraced the artistic tradition it held. “An artist friend once told me that there are two kinds of artists—the eyeballers and the cerebrals,” he said. “I’m an eyeballer, I’d say. I’m inspired by things I see.” He created thousands of paintings and drawings during his time at the farm, with numerous images of the farm itself. These works, primarily landscapes in oils and watercolors, continued to gain recognition in greater community. He won several prestigious awards, such as the Salmagundi Club Award in 1962, and an election to the National Academy of Design in 1994. He exhibited frequently in galleries in Connecticut and New York, and his work was featured twice in the publication, American Artist. Additionally, Andrews was a teacher, holding classes at the Silvermine School of the Arts and the Wooster Community Arts Center.
Sperry Andrews died on July 14, 2005. Both he and his wife Doris are remembered as the steadfast and resolute stewards of Weir Farm, as well as for leaving their own artistic contribution to the legacy of the site.