William George Henry was a medical student at the Toronto School of Medicine from 1878-1880 before enrolling at McGill in 1880. He graduated from the Faculty of Medicine in 1883 with honourable mention. He was appointed to the resident staff of the Montreal General Hospital following graduation.

Montrealer R.A.C. Henry took a double degree - B.A. and B.Sc.- from McGill in 1912. In 1912 he joined the federal Department of Railways and Canals as an inspecting engineer, and in 1923 became the Director of the Bureau of Economics of the C.N.R. He returned to the Department of Railways and Canals as deputy minister in 1929. Henry became vice-president and general manager of Beauharnois Corporation in 1930 and vice-president of Montreal Heat, Light and Power in 1939; he held both positions until 1944. During World War II, he served as economic adviser, and later executive assistant to the Minister of Munitions, deputy minister of the Department of Reconstruction, and president of Defence Communications Ltd., a crown corporation formed to coordinate communications systems in Eastern Canada on behalf of the armed forces. Henry was also Canada's representative on the Transportation Equipment Committee, surveying transportation needs in liberated war areas. He was named chairman of the Air Transport Board in 1944, but resigned in 1948 to take up a post as executive vice-president of Marine Industries Ltd, a position he held until his death. From 1952 to 1954, he was consulting engineer to the St Lawrence Seaway Project.

Joseph Alexander Henry was born on December 17, 1797, in Albany, New York.

He was an American scientist, educator, and the first Smithsonian Secretary (1846-1878). In 1819, he entered The Albany Academy, where he was given free tuition. Here Henry worked as both a chemical assistant and lecture preparer. In 1826, he was appointed a Professor of Mathematics and Natural Philosophy, and it was here that he began his scientific research on electromagnetism and worked on the development of the telegraph. In 1832, Henry was named Professor of Natural History at the College of New Jersey (now Princeton University), and his tour of European scientific centers in 1837 established his international reputation in science. His achievements as both an educator and scientist made him a prime candidate for the position of Smithsonian Secretary in 1846. Despite the challenges of the Civil War, he focused the Smithsonian on research, publications, and international exchanges. By 1849, he created a program to study weather patterns in North America, a project that eventually led to the creation of the National Weather Service. In 1852, he became a member of the U.S. Lighthouse Board, becoming its chairman in 1871, a position he held until his death. He was elected a member of the American Philosophical Society in 1835 and the American Antiquarian Society in 1851. In 1915, Henry was inducted into the Hall of Fame for Great Americans in the Bronx, New York.

In 1830, he married Harriet L. Alexander (1810–1882). He died on May 13, 1878, in Georgetown, Washington, D.C.

Alexander Henry, businessman, fur trader and author entered service of the North West Co. in 1799. His activities were centered in what is now the Canadian and the American North-West in the areas of the Pembina, Vermilion, North Saskatchewan and Columbia Rivers. He was drowned near Fort George on the Columbia in 1814.

Alexander Henry (The Younger) is estimated to have been born in 1765, he died in 1814 in Fort George, now known as Astoria, Oregon. He was a nephew of Alexander Henry (The Elder) and had various relatives in the fur trade. According to his journal that he begun in 1799, he married, against his will, an unknown Ojibwa woman who was the daughter of the Buffalo Chief Liard. They had about six children. In 1791, Henry worked with the North West Company and traded with the Ojibwe of the Lower Red River. In 1800, he wrote in his journal that he traded rum for dried buffalo with the Ojibwe. In his journal, Henry described Indigenous peoples as “creatures” and that he judged them by “European standards.” His journal is one of the most detailed records from the 19th century in providing information about the fur trade between Lake Superior and the Columbia River.

Alexander Henry (also known as Alexander Henry the Elder) was born in 1739 in New Brunswick, New Jersey, and died in 1824 in Montreal. He was the eldest son of merchant John Henry and Elizabeth Henry (her maiden name is unknown). Henry married an unknown Indigenous woman “a la façon du pays” and was said to have had several children, though only one daughter is recorded. After returning to Montreal in 1785, he then married Julia Calcutt Kittson (Julia Ketson, 1756-1835), who was the widow of John George Kittson, an Anglo-Irish army officer. They had around five known children and Henry was the stepfather of two children. From the age of twenty, Henry worked as a merchant out of Albany, New York, and supplied the British army during the French and Indian War (the North American front of the Seven Years’ War). In 1760, Henry was the first known Englishman to have visited the area of Milwaukee and he soon after secured a fur-trade pass for the area. He travelled to Michilimackinac when the Ojibwe had yet to make peace with the English and met the war chief Mihnehwehna (also known as Minweweh), who admired Henry’s bravery for entering Ojibwe lands. In the winter of 1761, another Ojibwa chief named Wawatam, adopted Henry as a brother. Between 1762 and 1763, Henry did business in Sault Ste Marie, where he formed friendships with Jean Baptiste Cadot Sr., and Sir Robert Davers. When the Ojibwe warriors attacked Fort Michilimackinac, Davers was killed, and Henry was captured. Henry was taken to Mackinac and ended up as a possession of the Ojibwe leader Minavavana. Wawatam ensured Henry’s protection by taking him in to live with him for nearly one year, where Henry followed Wawatam and his family on their seasonal hunting and fishing moves in lower Michigan. In 1765, Henry acquired a license to trade in the Lake Superior region and in 1767 to 1768, he wintered on the Michipicoten River and formed a partnership with Sir William Johnson and others, forming a company to mine silver found in copper ore on the shores of Lake Superior. Along with Cadot, Peter Pond, and brothers Thomas and Joseph Frobisher, Henry stopped at Cumberland House and built a trading post on Amisk Lake to challenge the Hudson’s Bay Company. In 1776, Henry set off by foot to Fort à la Corne, following the Saskatchewan River. He purchased twelve-thousand additional beaver skins from the Chipewyan during a trip up the Churchill River. Henry returned to Montreal and gave the governor, Sir Guy Carleton, a large map of the western region through which he had travelled. He then sailed to England in the autumn of 1776 with a proposal for the Hudson’s Bay Company and then went to France where he was received by Marie-Antoinette in the French Court. In 1792, Henry and his nephew Alexander Henry the Younger obtained one share in the North West Company for six years. Four years later, he sold his interest to William Hallowell but continued to buy furs from traders to export to England. Henry served as captain in the militia and from 1794 to 1821 served as justice of the peace. In 1812, he was appointed vendue master and King’s Auctioneer for the district of Montreal. He wrote a memoir of his life titled Travels and Adventures in Canada and the Indian Territories: Between 1760 and 1776, which he published in 1809.

Henry Watts & Co was a business based in Pittsburgh, Philadelphia that dealt in real estate securities, arranging the purchase of plots of land for interested buyers. Located in suite 1501 of the Henry W. Oliver Building, the company existed between roughly 1909 and 1915. An August 1911 memorandum of agreement formalized the relationship between Henry Watts and Hugh C. Barr, the other primary agent of Henry Watts & Co. Together they would sell land in Canada, primarily Alberta, to American buyers and split the profits. Henry Watts & Co secured a partnership with Leighton & Gilbert, who were a similar business located in Calgary, and who had the additional advantage of being official agents of the Canadian Pacific Irrigation Colonization Co. Thus, with Leighton & Gilbert notifying them of promising land for sale, Henry Watts & Co. would establish relationships with businessmen around Philadelphia and Pittsburgh, invite them to tour Alberta by train, and arrange the sale of land when they closed a deal.