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Gerald O'Reilly, physician (b at Ballinlough, Ire 11 Aug 1806; d at Hamilton, Canada W 26 Feb 1861). After medical studies in Dublin, Ire, and London, Eng, he immigrated in 1833 to Hamilton, where he was a prominent practitioner.

John Stanley Plaskett, astronomer (b at Hickson, UC 17 Nov 1865; d at Esquimalt, BC 17 Oct 1941). Born on a farm, Plaskett joined the Edison Co in Schenectady, New York, and Sherbrooke, Québec.

Douglas Humphreys Pimlott, conservationist, wildlife biologist, ecologist, environmentalist (born 4 January 1920 in Quyon, QC; died 31 July 1978 in Richmond Hill, ON). A founder of the modern environmental movement in Canada.

Sir Edward Sabine, soldier, scientist (b at Dublin, Ire 14 Oct 1788; d at Richmond, Eng 26 June 1883). He fought along the St Lawrence River in Upper and Lower Canada in 1813-14, and then, within the army, went on to a distinguished career in science.

Joseph Algernon Pearce, astrophysicist (b at Brantford, Ont 7 Feb 1893; d at Victoria, BC 8 Sept 1988). Together with J.S.

Robert Hamilton Coats, FRSC, statistician, journalist (born 25 July 1874 in Clinton, Ontario; died 7 February 1960 in Ottawa, Ontario). Robert H. Coats was the first Dominion statistician of Canada (see Statistics Canada). He spent 24 years as the country’s chief statistician. During his career, he modernized and expanded Canada’s census and data collection programs.

Donald McKay, designer and builder of clipper ships (b at Jordan Falls, NS 4 Sept 1810; d at Hamilton, Mass 20 Sept 1880). As a boy he learned the shipbuilder's trade in his father's and uncle's shipyards on the Jordan River.

Frank Lucius Packard, novelist, short story writer, engineer (born at Montréal, Que., 2 Feb 1877; died at Lachine, Que., 17 Feb 1942).

Helen Irene Battle, zoologist, educator (b at London, Ont 31 Aug 1903; d there 17 Jun 1994). A pioneering Canadian zoologist and much-loved teacher, she was emeritus professor of zoology at the University of Western Ontario from 1972.

Henry Wolsey Bayfield, naval officer, hydrographic surveyor (b at Hull, Eng 21 Jan 1795; d at Charlottetown 10 Feb 1885). At age 11, Bayfield joined the Royal Navy. In 1816 he was engaged by Captain W.F. Owen to assist in surveying Lake Ontario.

Charles James Stewart Bethune, clergyman, entomologist, educator (b in W Flamborough Twp, Upper Canada 11 Aug 1838; d at Toronto 18 Apr 1932). He was a graduate of Toronto's Upper Canada College and University of Toronto's Trinity College (BA 1859) and was ordained an Anglican priest in 1862.

Bristow Guy Ballard, research engineer (b at Fort Stewart, Ont 19 June 1902; d at Ottawa 22 Sept 1975). Ballard was educated at Queen's and worked for 5 years on Westinghouse high-speed electric locomotives before joining the National Research Council staff in 1930.

William Peyton Hubbard, politician, inventor, baker, coachman (born 27 January 1842 in Toronto, ON; died 30 April 1935 in Toronto). Hubbard was Toronto’s first Black elected official, serving as alderman (1894–1903, 1913) and controller (1898–1908), and as acting mayor periodically. A democratic reformer, he campaigned to make the city’s powerful Board of Control an elected body. Hubbard was also a leading figure in the push for public ownership of hydroelectric power, contributing to the establishment of the Toronto Hydro-Electric System.

Arthur Newcombe Bourns, OC, FRSC, professor of chemistry, university administrator (born 8 December 1919 in Petitcodiac, NB; died 29 May 2015 in Burlington, ON).

Zbigniew Stanislaw Basinski, physicist (born 28 April 1928 in Wolkowysk, Poland; died 12 August 1999). Recognized as the doyen of Canadian metal physics, he received the BSc, MA, DPhil and DSci degrees from Oxford, at the same time holding the post of research assistant in the department of metallurgy.

Édouard-André Barnard, agronomist and journalist (b at Trois-Rivières, Qué 30 Sept 1835; d at Varennes, Qué 19 Aug 1898). An important Québec agronomist in the second half of the 19th century, Barnard had abandoned his studies early to go into trade.

Jacques Genest, physician, medical researcher (b at Montréal 29 May 1919), founder of the Institut de recherches cliniques in Montréal.

There are five veterinary colleges in Canada: the Ontario and Atlantic Veterinary Colleges; the Western College of Veterinary Medicine; and the faculties of veterinary medicine at the Université de Montréal and the University of Calgary.

Robert (Bob) Brent Thirsk, biomedical engineer, astronaut (b at New Westminster, BC 17 Aug 1953). He studied mechanical engineering at the University of Calgary (BSc, 1976) and the Massachusetts Institute of Technology (MSc, 1978), and he received an MD from McGill University in 1982.