Martin Ryle (1918-1984) was a British astrophysicist who developed the aperture synthesis technique of interferometry and constructed large radio telescopes, using them to discover and catalogue numerous radio sources. He guided the Cambridge radio astronomy group in the production of several important radio source catalogues.

Harry H. Plaskett FRS (July 5, 1893 - January 26, 1980) was a Canadian astronomer who made significant contributions to the fields of solar physics, astronomical spectroscopy and spectrophotometry. From 1932 to 1960, he served as the Savilian Professor of Astronomy at the University of Oxford, and in 1963 was awarded the Gold Medal of the Royal Astronomical Society.

Bertil Lindblad (Örebro, 26 November 1895 – Saltsjöbaden (outside Stockholm, 25 June 1965) was a Swedish astronomer.

Alfred H. Joy (1882–1973) was an astronomer at the Mount Wilson Observatory from 1915 to 1973 who measured spectroscopic parallaxes and radial velocities of stars and studied variable stars. He invented the T Tauri classification.

After graduating MA from Oberlin College in 1904, Joy went on to work at the American University of Beirut in the Syrian Protestant College as a professor of astronomy and the director of the observatory. He was forced to return to the U.S. in 1915 because of the 1st World War.

Ejnar Hertzsprung (8 October 1873 – 21 October 1967) was a Danish chemist and astronomer.

Hertzsprung was born in Copenhagen. In the period 1911–1913, together with Henry Norris Russell, he developed the Hertzsprung–Russell diagram.

Wilhelmina Iwanowska was born in Wilno, Poland, where she studied mathematics at the University, obtaining her D.Sc. degree in astronomy in 1933 and a Docent in 1937. She had been working at the Wilno Observatory, however, since 1927.

Helen Battles Sawyer Hogg, CC (1 August 1905 – 28 January 1993) was an astronomer noted for her research into globular clusters. She is best remembered for her astronomy column, which ran from 1951 until 1981 in the Toronto Star, and her articles on the history of astronomy which ran from 1946 until 1965 in the Journal of the Royal Astronomical Society of Canada under the title “Out of Old Books”.

Leo Goldberg (26 January 1913 – 1 November 1987) was an American astronomer who held professorships at Harvard and the University of Michigan and the directorships of several major observatories. He was president of both the International Astronomical Union and the American Astronomical Society. His research focused on solar physics and the application of atomic physics to astronomy, and he led many of the early efforts to study the Sun from space telescopes.