[1] Trained as a shipbuilder, he was contracted by the South Australian Company on the South Australian with David McLaren, arriving at Kangaroo Island on 22 April 1837,[2] to manage the purchase and loading of major machinery which was ultimately used for "Fletcher's Patent Slip", for the Company's flour mill, eventually installed on the Torrens where the Hackney Hotel is now, and for a sawmill which may have been used at Cox's Creek.

Shortly after arrival on Kangaroo Island, Mildred, T. H. Beare and William Giles imported a batch of Merino ewes from Van Diemens Land, some of the first brought into the colony, though stock losses on the unusually long trip aboard the Cygnet were considerable.

[4] The land he selected, on Fourth Creek, and where he lived for the rest of his life, turned out to be quite valuable, and made his fortune.

He was married to Elizabeth Sarah, née Bowyer, and had three sons and two daughters: He died at the home of Dr. Mortimer, Port Adelaide.

Henry's brother George Mildred (c. 1808 – 13 December 1875), arrived in South Australia in 1836 on William Light's ship Rapid with nephew Hiram and settled on Kangaroo Island.