Herbert S. Klein is Gouverneur Morris Professor Emeritus of History at Columbia University, the former director of the Center of Latin American Studies and Professor of History, Stanford University and is currently Research Fellow and Latin American Curator at the Hoover Archives. Specializing in the social, demographic, and economic history of Latin America, he has published over 30 books and 189 articles in several languages. Among these books are four comparative studies of slavery, as well as several on Bolivia, including Parties and Political Change in Bolivia, 1880–1952, and Haciendas and Ayllus.