Maurice was the son of Irish born wine and spirit merchant John Augustus O'Shea (died 1912) and Leontine Frances, née Beaucher.
O'Shea married Marcia Singer Fuller on 2 December 1925 at St Peter's Anglican Church, Hamilton.
[1] A biography of Maurice O'Shea was written in 2006 by wine writer Campbell Mattinson.
[5] In 1925, Maurice began making wine on his family's vineyard,[6] which he named Mount Pleasant, in Pokolbin in the Hunter Valley in New South Wales.
Those honoured include Max Schubert in 1990, Wolf Blass in 2000 and Ray Beckwith in 2006.