John Campbell is the Ralph Bunche senior fellow for African policy studies at the Council on Foreign Relations. He is the author of "Nigeria: What Everyone Needs to Know," which will be published in July 2018. From 1975 to 2007, Campbell served as a U.S. Department of State Foreign Service officer. He served twice in Nigeria, as political counselor from 1988 to 1990, and as ambassador from 2004 to 2007. Campbell's additional overseas postings include Lyon, Paris, Geneva and Pretoria. He also served as deputy assistant secretary for human resources, dean of the Foreign Service Institute's School of Language Studies, and director of the Office of U.N. Political Affairs.