Jean Opsomer, PhD, is a senior statistician with 25+ years of experience applying statistical methods to answer research questions. He is currently responsible for the statistical methodology of several large-scale Westat survey projects. He has served on 6 panels of the National Academies of Sciences, Engineering, and Medicine and is a current member of the Statistics Canada Advisory Committee on Statistical Methods. He is the Chair of the Survey Research Methods Section of the American Statistical Association and Associate Editor for Survey Methodology.