Steven B. Cohen has been working in the fields of biostatistics, survey design, sampling, survey methods and health services research for more than 35 years. He has expertise in management, health services research, health policy, biostatistics, sampling theory, modeling, complex survey design, multivariate analysis, demographic techniques, epidemiological techniques, categorical data analysis, and applied statistical methods. Prior to coming to RTI, he was Director of the Center for Financing, Access and Cost Trends at the Agency for Healthcare Research and Quality. He is co-author of the text, Methodological Issues for Health Care Surveys. Dr. Cohen has served as an Associate Professor at the Johns Hopkins University and at the George Washington University. He is also a Fellow of the American Statistical Association and an elected member of the International Statistical Institute.