In 1822 he was appointed British secretary and medical officer to the Boundary Commission, and for several years he made extensive and important geological researches, contributing papers to the American Journal of Science and other scientific journals; and later embodying an account of his travels in a book entitled The Shoe and Canoe (1850).
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In 1816, he joined the British Army as an assistant surgeon and was stationed at the Cape of Good Hope in 1817.
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The following year, he was appointed medical officer to a German Rifle Regiment in the English service and posted with them to British North America.
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He was the first person to investigate and describe the Oak Ridges Moraine.
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