[1][2] Foster originally made his living on their farm, but he also attended medical lectures in Quebec.
He was licensed to practise medicine in the province in 1830, and began serving a large area in the Eastern Townships, which did not have many doctors.
[1][2] In 1859, Foster was appointed a coroner for the Bedford District, a position he held until his death in 1868.
[1][2] Following the Lower Canada Rebellion in 1837 and 1838, and the similar rebellion in 1837 in Upper Canada (now Ontario), the British government decided to merge the two provinces into a single province, as recommended by Lord Durham in the Durham Report.
He continued to be a member of the "British Tory" group from Lower Canada, supporting the Governor and opposed to the reformers.
In the general election of 1848, he was defeated by a reform candidate, Lewis Thomas Drummond.
Foster was actually glad to return to his medical practice and took no further part in politics.