About Charlotte Barnum
Charlotte Cynthia Barnum, mathematician and social activist, was the first woman to receive a Ph.D. in mathematics from Yale University. Charlotte Cynthia Barnum (May 17, 1860 – March 27, 1934), mathematician and social activist, was the first woman to receive a Ph.D. in mathematics from Yale University. She persisted and with the support of Simon Newcomb, professor of mathematics and astronomy at the university, she won approval to attend lectures without enrollment and without charge.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.