Helen Battles Sawyer Hogg (August 1, 1905 – January 28, 1993)[1] was an American-Canadian astronomer who pioneered research into globular clusters and variable stars.

Academically gifted, Helen graduated from Lowell High School at the age of 15, but chose to stay for another year before leaving to attend Mount Holyoke College in 1922.

[3] Dr. Sewell took her class to see the solar eclipse of January 24, 1925 and a year later Annie Jump Cannon, an astronomer working at Harvard University, came to visit Mount Holyoke.

In 1935 Hogg moved to the University of Toronto, after her husband had received a job offer to work at the David Dunlap Observatory.

[3] During the late 1930s, Hogg became one of the first astronomers to travel and work around the world to advance her research, as the globular clusters she was observing were best seen from the southern hemisphere.

[5] From 1939 to 1941, Hogg returned to America to serve as the president of the American Association of Variable Star Observers (1939–1941) and the acting chair of Mount Holyoke's astronomy department (1940–1941).

[3][4] Upon returning to the David Dunlap Observatory, she took on teaching duties at the University of Toronto, largely as a result of male staff being away due to World War II.

[3] In addition to her advocacy and awareness work, "Helen presided over several Canadian astronomical and scientific organizations", and "served on the board of directors of Bell Telephone Company of Canada from 1968 to 1978".

[3] Frank died in 1951 of a heart attack, and Helen picked up many of his professional responsibilities in addition to raising their three children.

[3] An obituary written about Hogg's contributions to physics and astronomy was printed in the Journal of the Royal Astronomical Society of Canada.