BAR HARBOR (AP) – A longtime summer resident of Maine has given the nonprofit Mount Desert Island Biological Laboratory $1 million.

Kathryn Davis’ donation is the largest private gift in the history of the MDI laboratory, a leading marine research institution. Davis celebrated her 100th birthday on Feb. 25, and was making several personally meaningful gifts to commemorate the event. Terence Boylan, chairman of MDI lab’s board of trustees, called Davis’ gift “a magnificent act of generosity.”

Davis, a resident of Northeast Harbor and Jupiter Island, Fla., is a noted philanthropist and patron of the arts. Her husband, Shelby Cullom Davis, was ambassador to Switzerland from 1969 to 1975.