(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).
(1908-2002) RASC National President (1966-1968) during Canada's Centenary, Chief of the Positional Astronomy and Time Service (1957-1966), and Chief of the Astronomy Division (1966-1970) at the Dominion Observatory. When the DO closed, he became head of the NRC's Time and Frequency Section of the Physics Division (for more information, see http://adsabs.harvard.edu/abs/2002BAAS...34.1385H.) —RAR