Aitchison's mother was a musician and her father, Clyde Bruce Aitchison, was a lawyer and economist who served on the Interstate Commerce Commission. She was born on July 18, 1908, in Portland, Oregon. Aitchison lived in Portland until 1916 and then in Washington, DC for the rest of her childhood.
Education
Aitchison attended Central High School. She earned a bachelor's degree from Goucher College in 1928. After working for a year as an actuary in New York City, she began graduate studies at Johns Hopkins University in mathematics, completing her Master's in 1931 and her Ph.D. in 1933. Her dissertation, supervised by Gordon Thomas Whyburn, was entitled On Mapping with Functions of Finite Sections, and concerned point-set topology; she also published two papers in the same area. At the University of Oregon, Aitchison completed a second master's degree in economics in 1937.
Career
Because of the Great Depression, employment as a mathematician was hard to find: she applied to 145 schools but was only able to find a one-semester temporary position, substituting for a sick instructor at the University of Richmond's Westhampton College for Women. Following this, she worked from 1934 to 1935 at as a lecturer in statistics at American University in Washington, DC. Aitchison moved back to Portland in 1935, and after working for the Works Progress Administration in 1936. She returned to American University as a lecturer in statistics, and remained there until 1939, while also working for the United States Department of Agriculture and the Interstate Commerce Commission. From 1939 to 1942, she taught economics at the University of Oregon, but by 1942 she returned to the federal government to work in transportation economics, a career that would last the rest of her life. From 1942 to 1951, Aitchison was a statistician and later a transportation economics with the Interstate Commerce Commission. She also lectured at American University from 1942 to 1944, and consulted with the Office of Defense Transportation during World War II. From 1951 to 1953, she headed the Transport Economics Division of the United States Department of Commerce's Office of Transportation, but this division was eliminated in 1953. She then became Director of Transportation Research in the Bureau of Transportation of the United States Postal Service, becoming both the top woman at the Postal Service and "the first woman to be appointed to a policy level postal position". When she retired in July 1971, Aitchison "was one of the highest ranking women in the federal service".
