John Joseph Wallis is Professor in the Department of Economics, University of Maryland, and an NBER Research Associate. He is an economic historian who works on the interaction of political and economic development. He is particularly interested in how patterns of economic institutions change over time and specifically how patterns of economic institutions interact with political institutions in a way that make both economic and political institutions sustainable over time. Most of his work has been in American history, but over the last decade he has begun working on contemporary development problems around the world. His interests span economics, institutional economics, political economy, economic history, development economics, political science, and history.