Isaac Buchanan was a businessman, political figure and writer in Upper Canada, then Canada West, Province of Canada. Born in Glasgow, Scotland, he emigrated to British North America in 1830, settling first in Montreal, then York, and then Hamilton. At the height of his business career, he had an extensive house and estate in Hamilton, which he named "Auchmar", in recognition of his Clan Buchanan roots in Scotland.

A study in the organization and development of Canadian trade by McCalla, Douglas (1972) (pdf) You can borrow this book for 14 days on the Internet Archive.

Isaac Buchanan M.P.P.
Representative in the Commons House of Parliament of Canada, and President of the Board of Trade for the City of Hamilton in which same capacities he served the City of Toronto, the Metropolis at the Union of the Canada's (pdf)

More on him from Wikipedia (pdf)