Thomas Livingstone Mitchell was a surveyor and administrator in the early years of the Australian colony. Mitchell received his training in surveying while serving in the British Army in the Peninsular War. In the late 1820s, Mitchell sought opportunity in Australia, where he served as assistant and then surveyor-general of New South Wales. He led four expeditions into the interior of Australia in the 1830s and 1840s, publishing two successful voyage accounts. He was also a politician and inventor of a boomerang-style ship’s propeller.