Asif Efrat is Visiting Assistant Professor of Law at Cornell Law School, Ithaca, N.Y. He can be reached at ae236@cornell.edu.

Michael C. Horowitz is Assistant Professor of Political Science at the University of Pennsylvania, Philadelphia. He can be reached at horom@sas.upenn.edu.

Jason Lyall is a Postdoctoral Research Associate in the Department of Political Science at Yale University, New Haven, Conn. He can be reached at jason.lyall@yale.edu.

Jonathan Mercer is Associate Professor of Political Science at the University of Washington, Seattle. He can be reached at mercer@uw.edu.

Eric Neumayer is Professor in the Department of Geography and Environment at the London School of Economics and an Associate of the Centre for the Study of Civil War, International Peace Research Institute Oslo (PRIO). He can be reached at e.neumayer@lse.ac.uk.

Krzysztof J. Pelc is a Niehaus Center for Globalization and Governance Fellow at Princeton University, and an Assistant Professor in the Department of Political Science at McGill University, in Montreal, Canada. He can be reached at kpelc@princeton.edu.

Thomas Plümper is Professor in the Government Department at the University of Essex, UK, and an Associate of the Centre for the Study of Civil War, International Peace Research Institute Oslo (PRIO). He can be reached at tpluem@essex.ac.uk.

Solomon Polachek is Distinguished Professor of Economics and Political Science at the State University of New York at Binghamton. He can be reached at polachek@binghamton.edu.

Jun Xiang is a Ph.D. candidate in Political Science at the University of Rochester, N.Y. He can be reached at jun.xiang@rochester.edu.