A former Director of the US Census Bureau, Kenneth Prewitt is Carnegie Professor of Public Affairs, School of International and Public Affairs at Columbia University.  His research includes the use of ethnoracial classification in national statistics.  He has authored or co-authored a dozen books and more than 100 articles and book chapters, including What is Your Race? The Census and Our Flawed Effort to Classify Americans and a report by National Academies of Science: Using Science as Evidence in Policy Making.