He emigrated to America in 1811, becoming a clerk in the Pacific Fur Company.
He then became a clerk with the North West Company, but he retired 1817 and returned to Ireland.
He became the Irish correspondent for the London Morning Herald as well as a clerk in the Dublin police office.
Cox's Adventures on the Columbia River (London, 1831) is one of the most important documents relating to the later history of the North West Company.
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