John L. Czajka retired from Mathematica as a Senior Fellow after 42 years with the organization but continues to work part time as an independent consultant. His research has focused on statistical applications of program administrative data and the analysis of survey data from large national samples, smaller-scale panel studies, and more-specialized surveys. His numerous projects have included comparative analyses of income and asset reporting in federal surveys, the application of statistical disclosure limitation to public use files of individual tax data, the design of longitudinal databases of tax records and Medicaid data, an analysis of the quality of Social Security number reporting in Medicaid administrative data, the use of linked survey and administrative data to study of the composition of households containing participants in the Supplemental Nutrition Assistance Program, an analysis of the dynamics of health insurance coverage, and a study of the feasibility of using Internal Revenue Service records to count the U.S. population.

Czajka is an elected Fellow of the American Statistical Association and a recipient of that organization’s Founders Award, which honors service to the Association. He has served on six review committees for the Committee on National Statistics of the National Academy of Sciences—most of these dealing with Census Bureau programs. He has a Ph.D. in sociology from the University of Michigan and a B.A. in government from Harvard University.