Professor Klein is the author of some 17 books and 145 articles in several languages on Latin America and on comparative themes in social and economic history. Among these books are four comparative studies of slavery, the most recent of which are The Atlantic Slave Trade (1999) and Slavery and the Economy of São Paulo, 1750-1850 (co-author) (2003), as well as four books on Bolivian history. His long-term interests are in comparative economic and social history, and he is currently working on 20th century social change in Latin America and the United States. Aside from courses on Latin America, he teaches methodology classes on quantitative methods in historical research and demographic history. He has been a Guggenheim fellow, a Woodrow Wilson Fellow, a Fulbright Lecturer several times and was a post-doctoral fellow at Yale and Oxford. He received his PhD from the University of Chicago. He is currently the director of the Center for Latin American Studies.