Christopher and Joanne Nelson- Unczur of Pittsfield announce the birth of a son, Jack Arthur, on August 3 at Cooley-Dickinson Hospital in Northhamptom. Jack weighed nine pounds and measured 21 inches at birth. His grandparents are Henry and Linda Unczur of Vineyard Haven and Dan and Rose Nelson of Ballston Spa, N.Y. Great grandparents are Priscilla Dickson of Vineyard Haven and the late Arthur B. Dickson.