Jude Tiersma lives and works in a Hispanic immigrant neighborhood in central Los Angeles as part of Cambria Community, Innerchange. She coordinates the concentration in urban mission at Fuller Theological Seminary, where she is pursuing her PhD studies.
Charles Van Engen served the National Presbyterian Church in Mexico in theological education, evangelism, youth ministries, and refugee relief from 1973-1985. In 1981 he completed the PhD in missiology from the Free University of Amsterdam. He is presently Associate Professor of mission, church growth, and Latin American studies at Fuller Theological Seminary.