Robert M. Park, epidemiologist, retired after twenty-three years in the Risk Evaluation Branch of the U.S. National Institute for Occupational Safety and Health (NIOSH), Cincinnati, Ohio. Education: BS, Physics, 1964 (MIT, Cambridge, Mass.); MS, Occupational Health and Biostatistics, 1981 (Harvard School of Public Health, Boston, Mass.). Prior to joining NIOSH, Mr. Park worked for the United Auto Workers (UAW) union for 16 years performing epidemiological investigations of illness and injury in the auto and related industries. Worker populations included those exposed to metalworking fluids, emissions from welding, foundry, painting, forging, electronics, assembly and other manufacturing operations, as well as musculoskeletal stress. At NIOSH, Park participated in risk assessments for: lung diseases caused by silica and the flavoring additive diacetyl; lung cancer associated with hexavalent chromium and cadmium; back injury in nursing home employees; bladder cancer and o-toluidine; neurological effects of manganese and acrylamide; sensitization and respiratory disease caused by toluene diisocyanate (for polyurethane); and mortality from perfluorooctanoic acid. His focus was on retrospective exposure assessment, design of exposure metrics, and statistical modeling for quantitative risk assessment. Past membership has included American Public Health Association, Society for Risk Assessment.