Kenneth R. Ross is Professor of Theology and Dean of Postgraduate Studies at Zomba Theological University, and Extraordinary Professor at the University of Pretoria. Earlier he served as General Secretary of the Church of Scotland Board of World Mission and, since 2012, has been an adviser to the World Council of Churches. He has published extensively on many different aspects of World Christianity, including the highly successful EUP book, The Atlas of Global Christianity 1910-2010, co-edited with Todd M. Johnson. Since 2013, Ross and Johnson have collaborated as Series Editors of the EUP Edinburgh Companions to Global Christianity.

Annemarie C. Mayer is Professor of Dogmatic Theology and the History of Dogma at the Theological Faculty of Trier, Germany. From 2013 to 2021 she held the Chair of Theology, Religion and Contemporary Culture at the Faculty of Theology and Religious Studies of the Catholic University of Leuven, Belgium. From 2011 to 2013 she was the Catholic consultant to the World Council of Churches in Geneva, Switzerland.

University of Trier, Germany

Todd M. Johnson is Paul E. and Eva B. Toms Distinguished Professor of Mission and Global Christianity at Gordon-Conwell Theological Seminary, South Hamilton, MA. Johnson is Associate Faculty at Boston University's Institute for Culture, Religion and World Affairs leading a research project on international religious demography. He has published encyclopedias, atlases, databases, monographs, and scholarly articles on counting religionists around the world.