Brother Aloysius Hannigan was born in Queensland in 1889 and became a Patrician Brother in 1906. He was the sixth Australian to join the Brothers, one year behind his brother Ignatius.
Br Aloysius became especially known for his piety and his ability to make friends. Amongst his friends were two ex-students who became NSW Premiers: Cahill and Renshaw.
He taught in most of the Patrician schools but spent most time at Holy Cross, ten of his twelve years there as principal during the war and picking up the pieces after the war: 1940 to 1943 and 1948 to 1953.
After five years as Novice Master at Wahroonga (1958 to 1962) he was moved to Redfern where he died at the age of seventy-five on the 1st July, 1964. He had been a Patrician for fifty-eight years.
He was appointed principal of Holy Cross in 1954 to 1956 and then again from 1960 to 1965. It was during this second principalship that he brought new life to the college and saw it became a significant regional school in the district. He gave the college state-of-the-art classrooms and science laboratories. In 1966 he was awarded a Membership of the British Empire (M.B.E.) for his services to education.
He returned to Ireland in 1968 and died there in August 2001 just after returning from a visit to Holy Cross.