Christopher Winship is the Diker-Tishman Professor of Sociology, Harvard University and a member the senior faculty at the Harvard Kennedy School of Government. He is a faculty associate of the Institute for Quantitative Social Science, the Program in Criminal Justice, the Ph.D. Program in Organizational Behavior, the Center for Public Leadership, the Safra Center for Ethics, and the Program in Social Inequality. He is past chair of both the Departments of Sociology at Harvard and Northwestern University. Prior to coming to Harvard in 1992, he was a Professor of Sociology, Statistics, and Economics at Northwestern. He has also been the Director of the Program in Mathematical Methods in the Social Sciences at Northwestern and interim Director of the Economic Research Center at the University of Chicago. He has a BA in Sociology and Mathematics from Dartmouth College (1972) and a Ph.D. in Sociology from Harvard University (1977). Along with Robert Sampson he is the founder of the Boston Area Research Initiative, an interuniversity research collaborative whose goal is to bring high quality research to local government decision making. He has been the editor of Sociological Methods & Research since 1995. He is an internationally recognized expert in the use of statistical methods for causal inference with nonexperimental data. His book co-authored with his former student Steve Morgan Counterfactuals and Causal Inference: Methods and Principles for Social Research has sold over 15,000 copies. It is often referred to as the “bible” of causal inference. With Ethan Fosse, he is currently writing a book on Age-Period- Cohort models. With Neil Gross and Isaac Reed, he is co-editing a book on Pragmatism and Sociology, the product of several highly successful conferences. He is also currently doing research on publication bias and the ontological basis of morality. In the past and presently, he has done extensive research on community policing in Boston. His former students are tenured professors at University of California Berkeley, Harvard University, University of Chicago, University of Wisconsin, University of Michigan, Northwestern University, along with others.