Though some books, including Kurt Beyer’s Grace Hopper and the Invention of the Information Age, reported that Hopper was the first woman to earn a Yale PhD in mathematics, the first of ten women prior to 1934 was Charlotte Cynthia Barnum (1860—1934). Murray, Margaret A. M. (2010). "The first lady of math?". Yale Alumni Magazine. Vol. 73, no. 5. pp. 5—6. ISSN0044-0051.