Lamin Sanneh (1942–2019) was a postcolonial African scholar from Gambia, West Africa, who made major contributions to the study of Islam in Africa and to the new field of World Christianity, which he helped create. He taught at the universities of Ghana, Aberdeen, and Harvard before settling at Yale University as a professor of history. Sanneh wrote more than a dozen books and over 200 articles on Christianity and Islam. It is difficult to study in the fields of mission or World Christianity without reference to Sanneh’s great legacy.