A lot of things on Martha’s Vineyard feel untouched by time. Jessica Harris’s 18th-century home in the sleepy town of Chilmark is one of them. A meandering, tree-lined country road leads to the 70-acre property where Harris, 50, lives with her husband Matt, 52, a partner at Bain Capital Ventures, and their six children.
“We never imagined that we would own something here,” says Harris, the former host and producer of the weekly NPR podcast From Scratch (she now sits on the board of…

