Grant, Campion and Company was one of the most important firms engaged in the fur trade to the southwest of Grand Portage (near Grand Portage, Minn.), Michilimackinac, and Detroit (Mich.) in the early 1790s. With Todd, McGill and Company, Forsyth, Richardson and Company, and Alexander Henry, the firm entered into negotiations with the North West Company concerning the allocation of trading zones, and in September 1792 the parties agreed not to prejudice one another’s interests. The partnership was dissolved in November 1795. Campion died soon after and Grant’s involvement in the fur trade ended.

George R. Grant was secretary and accountant to the Geological Survey of Canada. He was also an executor of Sir William Edmond Logan's estate.

Sir James Alexander Grant was born on August 11, 1831, in Inverness, Scotland.

He was a physician and politician. He came to Canada with his parents and studied at the University of Queen's College and McGill College (M.D., 1854). He served as president of the College of Surgeons of Ontario and president of the Mechanics' Institute and Athenaeum of Ottawa. He was a Fellow of the Royal College of Physicians, president of the Tuberculosis Association of Canada, the Canadian Medical Association, and was a delegate to many international medical congresses. He was an honorary member of the American Academy of Medicine. Grant represented Russell in the House of Commons of Canada as a Conservative Party of Canada member from 1867 to 1874. He also represented the City of Ottawa in the federal parliament from 1893 to 1896. He published a number of articles in medical journals in England and Canada and served as a physician to several Governors-General from 1867 to 1905. He was also a member of the Geological Society of England and also published articles on geological subjects. He was knighted in 1887.

In 1856, he married Maria Malloch (1835–1922). He died on February 6, 1920, in Ottawa, Ontario.

J.C. Grant was a legal professional who lived in Quebec in 1826.