Alexander came to the US in 1822, studying at Yale College. After marrying Sarah in 1827, he practiced law in upper New York state until 1839 when he and his family moved to Providence Rhode Island to assume control of his wife's family banking business upon the death of her brother, William.
Alexander was a close friend of the English writer and educator Eliza Fenwick. Eliza and family were frequent summer vacation visitors to his home in Canandaigua, New York.
When Eliza retired from her position at King's College in Toronto, she accepted an invitation from the Duncan's to live with him and his family at their new home in Sodus Bay on the shores of Lake Ontario. Eliza's granddaughter Elizabeth Rutherford came with her to act as governess for the Duncan's little girls.
Duncan Home in Sodus Bay
When the death of his wife's brother necessitated the Duncan's removal to Providence in 1839, Eliza and her granddaughter accompanied them.
The Duncan's were still living in Providence in 1860, but by the 1871 England Census, they had moved to London, England.
Alexander died in 1889 in London, England, less than a year after he lost his wife of sixty one years. His estate was valued at nearly 30,000 pounds. He is buried in Knossington Church Yard, Leicestershire, England. He also has a cenotaph in the North Burial Ground, Providence, Providence County, Rhode Island, USA.
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