Sonja Xia has obtained her Ph.D. in theology from K.U.Leuven, Belgium. Her research is on the formation of doctrines in the early Church. Before joining USJ, she worked as a post-doctoral research fellow in St. Louis University MO, and research fellow at Sun Yat-sen University. She has taught courses on the Bible and world religions. Currently, she teaches history and theology of the early Church as well as Mariology.