Erick Langer is associate professor of history at Carnegie Mellon University. He is the author of Economic Change and Rural Resistance in Southern Bolivia, 1880–1930 and editor, with Zulema Bass Werner de Ruiz, of Historia de Tarija: Corpus Documental.
Robert H. Jackson is the author of Indian Population Decline: The Missions of Northwestern New Spain, 1687–1840 and Regional Markets and the Agrarian Transformation in Bolivia Cochabamba, 1539–1960. He is an assistant professor in the Department of History and Geography at Texas Southern University.