Dr. Elliott is a senior principal researcher at RAND and holds its Distinguished Chair in Statistics. His areas of interest include quality measurement, Medicare, healthcare experiences, survey sampling, experimental design, casual inference, and case-mix adjustment in US and UK applications. He has developed Bayesian methods of estimating patient characteristics using name and address information. Elliott led HHS work developing novel, cost-effective sampling and analytic methods to improve national health estimates for small groups. Since 2006, he has led the CMS Medicare CAHPS® (Consumer Assessment of Health Providers and Systems) Analysis project, assessing patient experiences for 400,000 surveyed beneficiaries annually. Since 2012, he has been the RAND co-PI of AHRQ’s CAHPS project and was RAND’s lead statistician on that project 1996-2012. Elliott is a Fellow of the American Statistical Association and the first recipient of its Mid-Career Award (Health Policy Section). He has published more than 490 peer-reviewed articles (H-index=105). He serves on the editorial board of Medical Care Research and Review. In 2014 Elliott was recognized by Thomson Reuters as one of the Top 1% of Cited Scientists 2002-2012. In 2023, Elliott was named one of the world’s 100 most-cited social scientists by Research.com. In 2025, Elliott was ranked #1 in the World in Patient Experience by ScholarGPS. He received a Ph.D. in Statistics from Rice University.