William Yoo is Assistant Professor of American Religious and Cultural History at Columbia Theological Seminary in Decatur, Georgia. He is the author of American Missionaries, Korea...ver maisWilliam Yoo is Assistant Professor of American Religious and Cultural History at Columbia Theological Seminary in Decatur, Georgia. He is the author of American Missionaries, Korean Protestants, and the Changing Shape of World Christianity, 1884â€"1965.ver menos