[1] After living in England for some years, he arrived in Sydney, Colony of New South Wales, in 1822 with his mother where they were reunited with his father.

In 1867 and 1873, Halloran was involved in making arrangements for significant events such as welcoming the Duke of Edinburgh and the public funeral of William Charles Wentworth.

[3] He was known for supporting and encouraging young writers, even reportedly finding Henry Kendall a job in the Colonial Secretary's Department.

[1] Daniel Deniehy often praised Halloran's verses as “remarkable for their classic grace” and for their “manly gentleness”.

[3] Halloran's first marriage was in 1841 to Elizabeth Henrietta, the daughter of Joseph Underwood, with whom he had eight children, four boys and four girls before she died in 1889.