This early pioneer in psychology, who developed a new theory of color vision, received his/her Ph.D. several decades after completing all of the requirements for the degree.

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Christine Ladd-Franklin completed all the requirements for her Ph.D. in mathematics at Johns Hopkins University in the 1880s but was not awarded her degree until decades later, in 1926, due to the university's policy at the time against awarding doctoral degrees to women. She later developed a significant theory of color vision.

This Early Pioneer in Psychology, Who Developed a New Theory