Isaac Joslin Cox, Ph.D. (1873–1956) was an American professor of history. He was born at West Creek, Ocean Co., N. J. He graduated from Dartmouth College and for several years did research in Mexico. He then pursued postgraduate studies at the universities of Texas, Chicago, Wisconsin, and Pennsylvania. Between 1896 and 1906, Cox was employed at the San Antonio Academy as instructor and vice-principal, and instructor in history at the University of Cincinnati, where he was afterward assistant professor. In 1911-12, he delivered the Albert Shaw Lectures on Diplomatic History at Johns Hopkins University, and in 1919 became professor of history at Northwestern University. He was president of the Ohio Valley Historical Association.

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