Son of John Westgarth, surveyor-general of customs for Scotland, was born at Edinburgh, in June 1815. He was educated at the high schools at Leith and Edinburgh, and at Dr Bruce's school at Newcastle-on-Tyne. He then entered the office of G. Young and Company of Leith, who were engaged in the Australian trade, and realizing the possibilities of the new land, decided to emigrate to Australia. He arrived in Melbourne, then a town of three or four thousand inhabitants, in December 1840.