Todd M. Johnson (PhD, William Carey International University) is director of the Center for the Study of Global Christianity and associate professor of global Christianity at Gordon-Conwell Theological Seminary in South Hamilton, Massachusetts. He is also visiting research fellow at the Institute on Culture, Religion, and World Affairs at Boston University. Johnson is coauthor of "The World's Religions in Figures: An Introduction to International Religious Demography" and the "World Christian Encyclopedia", and coeditor of the "Atlas of Global Christianity".