Kate Holladay Claghorn (c. 1864 - May 22, 1938) was an American sociologist, scholar, and activist of the Progressive Era. Born in Illinois, Claghorn grew up in New York City, attending Bryn Mawr and then attaining a PhD from Yale University, one of the first women to do so, focusing her research at the intersection of economics, political science, history, and anthropology. She worked several jobs with the U.S. government before joining the New York Tenement House Department, establishing herself as an expert on immigration and statistics. In 1912, she took a teaching position and became head of the Department of Social Research at the New York School of Applied Philanthropy. Throughout her career, Claghorn was an advocate for the rights of immigrants, African-Americans, and women.

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