Studying medicine in London, where he became a member of the Royal College of Surgeons in 1842, he emigrated to Queensland in 1849 aboard the Fortitude, on which he served as the ship's doctor.

[4] The Governor General of New South Wales appointed Henry Challinor, Esquire, J.P. to be a coroner for the District of Ipswich on 20 October 1859.

Wheeler and the detachment of Native Police on that day under his command; and also that John Hardie, Grazier of Fassifern was cognizant of this fact, yet endeavoured to prevent a judicial enquiry into the cause of the death of the said Aboriginals by falsely attesting that no blacks had been shot on that station as had been reported.

"[6] Subsequent to that inquiry a Select Committee was established by the Queensland Legislative Assembly to report on the Native Police Force and the Condition of the Aborigines generally.

"[9][10] Dr Challinor MP wrote a letter to the Chairman of the Select Committee with his recommendations as regards a "Protective Force for the interior".

As a result of Challinor informing Justice Lutwyche of his findings, "Horton was pardoned and finally released from gaol on 2 April 1862 less than two months after his conviction.

The certificate appointed Henry Challinor as the surgeon in the Ipswich Rifles that formed part of the Volunteer Corps of Queensland.

It stated: "Know you, that I, Sir George Ferguson Bowen, the Captain-General and Governor-in-Chief aforesaid, Do, by virtue of the power and authority in me vested, under the Act of Council passed in the Eighteenth Year of Her present Majesty's Reign, and numbered Eight, hereby appoint you, the said Henry Challinor to be Surgeon in The Ipswich Rifles forming part of the Volunteer Corps of Queensland.".