John D. Coolidge, 80

Dr. John Duncan Coolidge, MD, died unexpectedly at Concord Hospital in Concord, on Jan. 25, 2026, at the age of 80.

Duncan was born on Oct. 5, 1945, in Portland, Maine, to Mary Louise and John Coolidge. He spent his childhood in Bronxville, New York, and Old Greenwich, Connecticut. He married the love of his life, Margaret (Margo) Smith, in 1967 and attended the University of Bridgeport in Connecticut, graduating with a degree in chemistry. He spent the next six years pursuing a graduate degree in oceanographic chemistry at the University of Hawaii and attending the University of Hawaii School of Medicine. Duncan completed his residency in internal medicine in Burlington, Vermont. After two years working for the National Health Service, he joined a colleague in a private medical practice in Franklin. Duncan was passionate about health care and his patients. He loved practicing medicine in Franklin.

Duncan and his family settled in an old farmhouse in East Andover, in 1981. He was a wonderful husband, father and grandfather. He loved spending time with his family, many outdoor activities such as sailing, skiing and camping, Cape Cod, Hawaii, his beloved Miata, and so much more.

Duncan put his engineering mind and his handyman skills to good use over the years remodeling and maintaining "this old house." His many varied intellectual interests were legendary. He shared his wonderful sense of humor with everyone, and he was so glad he could serve his town as selectman for two years. His good heart and his ready wit will live on through his family and the many great friends made over his lifetime.

Duncan is predeceased by his parents, Mary Louise Coolidge and John Coolidge of Pinehurst, North Carolina, his brother Daniel Coolidge of Andover, and his brother John, who died in infancy. Duncan leaves behind his wife Margaret, their children Kathleen and Jonathan, their spouses Timothy Eltzroth and Laura Coolidge, four grandchildren, his sister Mary Dean Perna and her spouse William Perna, and many nieces and nephews.

Calling hours will be from 4 to 6 p.m. on Monday, Feb. 9, at the Chadwick Funeral Home, 235 Main St., New London. His funeral mass will be at 11 a.m. on Tuesday, Feb. 10, at Immaculate Conception Church in Andover. Rev. Donald Clinton will officiate. All are welcome to attend.

Memorial contributions may be made to Twin Rivers Food Pantry, 2 Central St., Franklin, NH 03235. To sign an online guestbook, visit chadwickfuneralservice.com.