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In page Dorothy Hansine Andersen:

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After receiving her MD from Johns Hopkins University School of Medicine in 1926, Andersen intended to pursue a career as a surgeon, but because she was a female doctor in the 1920s, she could not find a position as a surgical resident.[1] Instead, Andersen began her career as an assistant in anatomy at Strong Memorial Hospital in Rochester, New York.[citation needed] In 1929 she began teaching at Columbia University College of Physicians and Surgeons as an assistant instructor in pathology.[2] In 1935, she was awarded a doctorate in medical science from Columbia University for her dissertation, “The Relation of the Endocrine Glands to the Female Reproductive Cycle."[3]