John William Mackay III (1905-1990)

John William Mackay III, of Matinecock Farm, Long Island, New York

Family
Notes / Biography Associated Houses References

Parents

Clarence Hungerford Mackay

Clarence Hungerford Mackay, of New York

1874-1938

Katherine (Duer) Mackay

Mrs "Kitty" Alexander (Duer) Mackay

1880-1930

Spouse

Josephine Gwendolyn Rose

Mrs "Gwen" (Rose) Mackay

1908-2004

Associated Houses

Harbor Hill

Roslyn, New York

Matinecock Farm

Lattingtown & Locust Valley, New York