Gina A. Zurlo (PhD, Boston University School of Theology) is associate director of the Center for the Study of Global Christianity at Gordon-Conwell Theological Seminary in South Hamilton, Massachusetts, and a research fellow at Boston University's Institute on Culture, Religion, and World Affairs. Her research interests include world Christianity, quantitative sociology, and mission studies. She is coeditor of the World Christian Database and coauthor of the World Christian Encyclopedia, 3rd edition.