Christine Ladd was born on 1 December 1847 in Windsor, Connecticut, and died on 5 March 1930 in New York City. She received her BA in 1869 and the LLD in 1887 from Vassar College. After teaching science and mathematics in secondary schools for several years, she undertook graduate study at Johns Hopkins University, admitted under special circumstances because the university was not open to women. Although she qualified for the PhD degree in 1882 it was withheld at that time because of her gender, but granted more than four decades later when the university celebrated its semi-centennial in February 1926. By then Ladd had attained an enviable reputation in both logic and psychology. She was the pioneer American woman in those two fields as well as in mathematics.
From The Dictionary of Modern American Philosophers in Oxford Reference.