Dr. John Till attended a meeting on November 3 and 4, 2015, in Oak Ridge, Tennessee, with NCRP Scientific Committee 6-9, “Deriving Organ Doses and Their Uncertainty for Epidemiologic Studies”. The committee’s objective is to prepare a report on dosimetry related to reconstruction of doses for epidemiology. The dosimetric issues involved are complex and differ among the varied exposed populations under evaluation: atomic veterans, DOE workers exposed to both penetrating radiation and intakes of radionuclides, nuclear power plant workers, medical radiation workers, and industrial radiographers. The NCRP report is envisioned to cover the specifics of practical dose reconstruction for the ongoing epidemiologic studies with uncertainty analysis evaluation.