(1865-1941) J.S. Plaskett played a pivotal role in the establishment of astrophysical research in Canada and helped to confirm the rotation rate of the Milky Way. He was an active member of the Ottawa Centre between 1907 and 1918, acted as an Associate Editor of the Journal for 28 years, and Society President (1914-15).

(1857-1940) F.R.S.C., F.R.A.S.C. Director of the Toronto Observatory and Superintendent of the Dominion Meteorological Service (1894-1929), and President of the Society (1902-03). He was knighted in 1916.

(1893–1962) Toronto Centre member; a prominent observer of his day; first Chant Medal recipient.

(1938–72?) Bert Topham's observatory at 1250 Castlefield Ave., Toronto.