1921 – 1960
During this period a number of successive Matrons acquired Diplomas of Nursing which were designed to better equip the holders for positions of responsibility.
Staff numbers increased fairly rapidly as can be seen in this photograph from the 1930s.

Wellington Hospital nursing staff, 1930s (courtesy WMHS Archives)
From 1944, after the opening of Hutt Hospital, the position of Matron-in-Chief was created. This title indicated over-arching responsibility for the Wellington Hospital Board’s institutions, and generally there were simultaneously employed Matrons of each of these institutions, in some instances having the title of Principal Nurse.