Martha Frederiks is Professor for the Study of World Christianity at Utrecht University, The Netherlands, and Extraordinary Professor at the University of Pretoria, South Africa. She is a contributing editor of the series Christian-Muslim Relations. A Bibliographical History (Leiden: Brill), co-editor of Studies in the Intercultural History of Christianity and with Lucien van Liere editor-in-chief of Exchange: Journal of Contemporary Christianities in Context (Leiden: Brill). Dorottya Nagy is Professor of Theology and Migration at the Protestant Theological University in Amsterdam (PThU), the Netherlands. Migration studies and awareness for responsible methodology lie at the heart of her academic interests. She is president of the Central and Eastern European Association for Mission Studies (CEEAMS) and editor of its journal.Together they published Religion, Migration, and Identity. Methodological and Theological Explorations (Leiden: Brill, 2017) and World Christianity. Methodological Considerations (Leiden: Brill, 2020).