Surveyor, pastoralist and member of the Dangar Family dynasty, Dangar arrived as a free settler in Australia in 1821. He was employed by the colonial government primarily as a surveyor, and his work soon led him to discover, during an expedition, the confluence of the Goulburn and Hunter Rivers. His skills as a cartographer and surveyor would then lead to his employment by the Australian Agricultural Company. He retired from the Company in 1833 to devote his time to the management of Neotsfield, his farm, which up until then, had been run by his younger brother William. Dangar's interests extended to ownership of a multitude of grazing properties (including Myall Creek Station), inns and stores, a position as magistrate as well as being a member of the colony's Legislative Council. He died in 1861.