Sonja Xia has obtained her PhD 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 post-doctoral research fellow in St. Louis University MO, and research fellow in Sun Yat-sen University. She has taught courses on Bible and world religions. Currently, she teaches history and theology of the early Church as well as Mariology.