Andrew G. Walder is the Denise O'Leary and Kent Thiry Professor in the School of Humanities and Sciences, and Senior Fellow in the Freeman Spogli Institute for International Studies. Previously, he served as chair of the Department of Sociology, as director of the Walter H. Shorenstein Asia-Pacific Research Center, and as Director of the Division of International, Comparative and Area Studies in the School of Humanities and Sciences. A political sociologist, Walder has long specialized on the sources of conflict, stability, and change in communist regimes and their successor states. His publications on China have ranged from the political and economic organization of the Mao era to changing patterns of stratification, social mobility, and political conflict in the post-Mao era. Another focus of his research has been on the political economy of Soviet-type economies and their subsequent reform and restructuring. His current research focuses on popular political mobilization in late-1960s China and the subsequent collapse and rebuilding of the Chinese party-state.