Andrew F. Walls (1928-2021) was honorary professor of world Christianity, University of Edinburgh, and a pioneering figure in mission history. A former missionary to Sierra Leone, Dr. Walls also taught at the University of Aberdeen, where he established the Centre for the Study of Christianity in the Non-Western World, now the Centre for the Study of World Christianity. He also served as professor of the history of mission at Liverpool Hope University and was emeritus professor of Akrofi-Christaller Institute, Akropong, Ghana. With Lamin Sanneh, he established the Yale-Edinburgh Group in 1992. Dr. Walls's books include The Missionary Movement in Christian History (a Christianity Today Book Award winner), Crossing Cultural Frontiers: Studies in the History of World Christianity, and (co-edited with Cathy Ross) Mission in the 21st Century: Exploring the Five Marks of Global Mission (all from Orbis Books).
