Donald Leo Fagan, 90, of Acworth, N.H., died peacefully at home on February 20, 2022, with family by his side. He was a devoted husband, father and grandfather, and is survived by his son, Brant, wife Heidi; his daughter, Karen Brotherton and husband John, of Cooperstown, NY; son, Shane of Acworth, NH; grandchildren David, Joshua, and Jacob Cormier, and Zachary and Camden Fagan, along with numerous nieces, nephews, and godchildren.  He is predeceased by his wife, Diane Fagan and brother Thomas Fagan.

Don received under- and post graduate degrees from Columbia University in New York City. After graduating, he coached crew at the New York Athletic Club and later at Cienfuegos Yacht Club on the south coast of Cuba. Don served a tour in the U.S. Army during the Korean War attaining the rank of Sergeant.

During his professional career, Don was player in the world of pharmaceutical market research for decades, both as Director of Market Research for Pfizer in the 1970s and early 1980s before starting his own firm, Shachtman-Fagan, Inc. which served all the major pharmaceutical companies for many years. Many products which are household names today were studied and tested by his firm.

Don enjoyed many decades of summers with his family on Great Island, on Lake Sunapee. Whether grilling on the deck, paddling or rowing early in the morning, or just relaxing on the deck with wife Diane by his side, he was always at peace on the Lake.

Don was an active and devoted parishioner of two parishes in Connecticut, and more recently, All Saints Parish in Charlestown, New Hampshire where he served as a Fourth Degree Knight of Columbus. He always enjoyed a good meal and conversation, no matter the location, subject, or crowd. He also loved traveling, learning about the world, and visited numerous countries around the globe.

A Mass of Christian Burial will be held on Monday, February 28, 2022, at 11 a.m. at St. Catherine of Siena Church in Charlestown, New Hampshire. Burial will follow at St. Mary's Cemetery in Claremont, New Hampshire. Arrangements are with Stringer Funeral Homes and Crematorium in Claremont, New Hampshire. Donations in his memory can be made to the St. Catherine's Council 6938 Knights of Columbus Scholarship Fund.

Dad, you are and always will be, missed by all who were blessed to know you and learn from you!