William Greene is Professor of Economics (emeritus) at theStern School of Business, New York University. His fields of interest are applied econometrics, panel data analysis, discrete choice modeling, production economics, health econometrics, transport economics and planning, and economics of the entertainment industry. He is also president of Econometric Software, Inc. He is the author of software LIMDEP and NLOGIT, textbooks Econometric Analysis (Ed.1 to 8), books on discrete choice modeling, Modeling Ordered Choices and Applied Choice Analysis, and over 100 articles in peer reviewed journals. He is the editor in chief of Foundations and Trends in Econometrics and of the Journal of Productivity Analysis. He has also consulted to industry, including American Society of Composers, Authors and Publishers (ASCAP), National Economic Research Associates (NERA), the U.S.EPA, Booz Allen, U.S. Postal Service and numerous others.