Born in Hingham, Massachusetts, but a long-time resident of New York, Hackett turned in his best results in doubles with Fred Alexander.
Harold Pinter | Harold Wilson | Harold Macmillan | Harold Bloom | Harold Godwinson | Harold Lloyd | Harold Stassen | Harold Prince | Steve Hackett | J. Harold Ellens | Harold Holt | Sir Harold Hillier Gardens | Harold Washington | Harold Hitz Burton | Harold Alexander, 1st Earl Alexander of Tunis | Harold Peto | Harold & Kumar Go to White Castle | Harold Arlen | Harold | Mims Hackett | Harold Budd | Harold Eugene Edgerton | Harold Bauer | Buddy Hackett | Bobby Hackett | Harold von Schmidt | Harold Robbins | Harold Laski | Harold Gould | Harold Gillies |
They lost to future International Tennis Hall of Famers Fred Alexander and Harold Hackett in 1906, and Raymond D. Little and Beals Wright in 1908.