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Born in Windsor, CT, I was an early graduate in linguistics and phusics at the newly opened Vassar College.

Because women were granted minimal access to labs and observatories, I shifted my academic interests from physics to mathematics.

As a high school mathematics teacher, I published a synopsis of trigonometric identities using quaternion notation.

Aided by James Joseph Sylvester, I studied mathematics and logic under Charles Sanders Pierce at Johns Hopkins University and wrote my dissertation On the Algebra of Logic....but the University did not award Ph.D.s to women.

A side interest was vision, especially color vision, leading to my publication of the text Color and Color Theories.

Also, I worked as a lecturer on logic and psychology at Johns Hopkins University (only female faculty member) and at Columbia University.

And finally, Johns Hopkins University awarded me a Ph.D., forty-four years after the completion of my dissertation.

Answer: Christine Ladd-Franklin (1847 1930)