Dr. Hill was a Research Associate Professor at the Survey Research Center, University of Michigan and Co-PI on the Health and Retirement Study. His main research interests revolved around panel survey methodology, broadly defined. He investigated longitudinal measurement error, panel attrition (both its correlates and its effect on parameter estimates) and remedial statistical models of attrition bias in event history models. Although in earlier years he concentrated on analysis of the Panel Study of Income Dynamics and the Survey of Income and Program Participation his later work concentrated almost exclusively on the Health and Retirement Study. His final work was assessing the extent to which reactive dependent interview improves the empirical validity of longitudinal changes in wealth measures. He died in 2011.