[4] In 2010 there were 160,000[5] Lebanese Maronite Catholics in 11 parishes, the largest of which is at Our Lady of Lebanon Co-Cathedral in Harris Park, New South Wales.

A piece of land of Harris Park in Sydney with a community hall was built and the foundation stone for the Church of Our Lady of Lebanon was laid in 1970.

Ziade helped to establish a Lebanese monastic order in Sydney and participated in the founding of the diocese in Australia.

The eparchy was erected on 25 June 1973 by Pope Paul VI's bull Illo fretis Councils.

His duties included the organization and establishment of additional Maronite eparchies in Australia and request help from other priests.

The first priests who had answered the bishop's request for help were Michal Boumelhem, Youseff Touma, Antoun Shalhoub and Nakhle Akiki.

In 1993, the Congregation of Maronite Missionaries were welcomed by parish priest Sarkis Charbel and founded their pastoral mission in Sydney.

The authorization for the acquisition of land for the establishment of a parent company for the Maronite nuns in Dulwich Hill has been permitted.

Under Hitti, the Lebanese Our Lady of Lebanon University and the Saint Charbel high school were inaugurated.