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Helen Sawyer Hogg, a notable American-Canadian astronomer, was born on August 1, 1905 in Lowell, Massachusetts.

She pioneered research into globular clusters and variable stars. She was the first female president of several astronomical organizations and a notable woman of science in a time when many universities would not award scientific degrees to women. Her scientific advocacy and journalism included astronomy columns in the Toronto Star ("With the Stars", 1951–81) and the Journal of the Royal Astronomical Society of Canada ("Out of Old Books", 1946–65).

Hogg first became fascinated by astronomy as a student at Mount Holyoke College. She changed her major from chemistry to astronomy and graduated magna cum laude. With the help of Annie Cannon, she then received a fellowship for graduate study at Harvard Observatory to work with Harlow Shapley. Radcliffe College awarded her a master's degree in 1928 and a PhD in 1931. (Harvard didn't award them to women.)

She married fellow student Frank Hogg and after she was awarded her doctorate, they moved to Victoria, British Columbia, where he was employed at the Dominion Astrophysical Observatory. The observatory wouldn't offer her a job, but this didn't stop her research. She was accepted as a volunteer assistant to her husband in order to use a telescope to continue her study variable star studies. Her groundbreaking work in astronomical catalogues that are still in use, as are the subsequent catalogues she completed.

In 1935 the family moved to Ontario when Frank was offered a job at the University of Toronto. Helen continued her observing at their David Dunlop Observatory and was given a job as a research assistant.

From 1939 to 1941, Hogg returned to America to serve as the president of the American Association of Variable Star Observers and as acting chair of Mount Holyoke's astronomy department. Upon returning to the David Dunlap Observatory, she took on teaching duties at the university. The male staff were away due to World War II, but she kept her position when the war was over. Hogg advanced to assistant professor in 1951, associate professor in 1955, full professor in 1957, and professor emerita in 1976 upon her retirement. Over her research career Hogg published more than 200 papers, and was a leading authority in astronomy.

Hogg was also very active in promoting astronomy to the public and in encouraging women into science.

[Wikipedia, Obituary in the Journal of the Royal Astronomical Society of Canada]
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Mona Evans
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