 He was survived by his wife of 63 years, the former Mary Waddill; his daughters Lyndy Pye of Northampton, Massachusetts and Virginia Pye of Richmond, Virginia; his son, Chris, of Northampton; and three grandchildren, Anna Swann-Pye (one of the three musicians in folk group String of Birds), and Eva and Daniel Ravenal.Separate memorial services were in Belmont, Massachusetts and at M.I.T.Charles Stewart, head of the M.I.T.