Newcomb started at the Lawrence Livermore National Laboratory (then University of California Radiation Laboratory) probably in 1955 in the Energy Directorate. He was also an adjunct professor in the UC Davis Livermore Department of Applied Science since 1971.
References
^Nahin, Paul J. (2019). Will you be alive 10 years from now? : and numerous other curious questions in probability : a collection of not so well-known mathematical mind-benders (with solutions, with one exception). Princeton: Princeton University Press. p. 184. ISBN9780691196367.