David Allan Poe Watt was born on April 2, 1830, in Ayrshire, Scotland.

He was a merchant, lobbyist, social reformer, and amateur naturalist. He was educated in grammar schools in Scotland before arriving in Montreal in 1846. Watt entered the mercantile trade as a commission merchant and broker specializing in produce. He served as treasurer of the Montreal Board of Trade from 1862 to 1865. He worked tirelessly throughout his career to protect and promote the commercial interests of Montreal merchants. Watt was also one of the organizers of the Montreal Corn Exchange, the Citizens' League, and the Montreal Art Association. Around 1882 he went into business for himself as a broker, and later he became a grain merchant. In 1912, he accepted the post of manager of North American export freight for Hugh Allan’s Montreal Ocean Steamship Company (the Allan Line), a post he held until his death. Watt contributed articles on North American ferns to the Canadian Naturalist and served as its editor.

In 1857, he married Frances Macintosh (1826–1876)). He died on December 13, 1917, in Montreal, Quebec.

The family of Mr. and Mrs. Graham McTavish Watt lived at 4081 Highland Ave., Montreal, QC, Canada in 1980.

W. H. Watson was born in Edinburgh and graduated from the University of Edinburgh in 1921 with first class honours in mathematics and natural philosophy. From 1921 to 1928 he taught physics at the University of Edinburgh and earned his Ph.D. in 1925. In 1928 he went as Carnegie Research Fellow to the Cavendish Laboratory in Cambridge, where he worked under Sir Ernest Rutherford. He received a second doctorate from Cambridge in 1931, and in the same year joined the Physics Department at McGill. He remained here until 1944, when he went to the University of Saskatchewan. His major research interest lay in electromagnetism.

William George Watson was born on the 6th of January 1952 in Lachine, LaSalle. Having grown up with a taste for writing, he first wished to major in English from McGill University in the early 1970s. But when he was gifted by his father a book on economy and took a course in the same field, that all changed forever. Since then, he would go on to become one of the most prominent scholars in the field of Canadian economics, a teacher at McGill University’s department of Economics from 1977 to 2017 and one of the few humorous columnists in his field. During the nineties, he would also marry, in 1991, lawyer Julia Scott and become the father of two boys, Scott Douglas Watson (born in 1993) and David George Watson (born in 1995). Since 2017, he has retired from his teaching appointment at McGill University at the age of 65 years old

Sereno Watson was born on December 1, 1826, in East Windsor Hill, Connecticut.

He was a botanist. He graduated from Yale University in 1847. He worked as a tutor at Iowa College from 1852 to 1854. In 1866, he entered the Sheffield Scientific School of Yale University and pursued the studies of chemistry and mineralogy. In 1867, he joined the Clarence King Expedition in California and eventually became the expedition botanist. Although he had no prior botanical training, Watson wrote the "Botany of the King Expedition" (1871). Asa Gray appointed him an assistant in the Gray Herbarium and Botanical Garden of Harvard University in 1873. In 1874, he became its curator, a position he held until his death. In 1881, he was appointed instructor in phytogeography. Watson was elected a Fellow of the American Academy of Arts and Sciences in 1874 and a member of the National Academy of Sciences in 1889. He received an honorary Ph.D. degree from Iowa University. He contributed many articles to the Proceedings of the American Academy of Arts and Sciences.

He died unmarried on March 9, 1892, in Cambridge, Massachusetts.