He was born June 19, 1951 in the Bronx of New York City to the late Dennis and Eileen (Davis) O'Brien. Throughout his life he moved many times, but for the last 12 years he had considered Keene home.
Dennis proudly served his Country, he loved greatly, in the United States Army.
He had been employed by AT&T as a Cyber Security Expert, from which he retired after 30 dedicated years.
On January 9, 1988 Dennis married the love of his life, Sandra Fuesz.
Dennis enjoyed his membership at the American Legion and spending time with friends. Hobbies he partook in included shooting and locksmithing. He will be greatly missed.
Dennis leaves behind his wife: Sandra O'Brien of Keene, NH; children: Sean O'Brien and his wife Jamie of Beachwood, NJ, Dennis O'Brien of West New York, NJ, Colleen O'Brien of Keene, NH, and Deepti Sharma of Queens, NY; grandchildren: Brianna, Jaylin, Lilly, Sean, and Ayden; as well as my dear friends.
Family and friends are invited to calling hours on Thursday, August 6 from 10:00 am to 12:00 pm at Fletcher Funeral Home, 33 Marlboro Street, Keene, NH. A graveside service with military honors will be held later that day at 2:30 pm at New Hampshire State Veterans Cemetery, 110 Daniel Webster Highway, Boscawen, NH.
In lieu of flowers, memorial contributions may be made in Dennis F. O'Brien's name to St. Jude Children's Hospital, 501 St. Jude Place, Memphis, TN 38105 (www.StJude.org).