Badi H. Baltagi is distinguished Professor of Economics and Senior Research Asssociate at the Center for Policy Research at Syracuse University. He was previously at TexasA&M University and the University of Houston. He is the author of Econometric Analysis of Panel Data and Econometrics and editor of A Companion to Theoretical Econometrics; Recent Developments in the Econometrics of Panel Data, Volumes I and II; Nonstationary Panels, Panel Cointegration, and Dynamic Panels; and author or co-author of over 100 publications, all in leading economics and statistics journals. Professor Baltagi is co-editor of Empirical Economics, and associate editor of Journal of Econometrics and Econometric Reviews. He is the replication editor of the Journal of Applied Econometrics and the series editor for Contributions to Economic Analysis. He is a fellow of the Journal of Econometrics and a recipient of the Plura Scripsit Award from Econometric Theory.