Kenneth L. Mossman is former Professor of Health Physics in the School of Life Sciences at Arizona State University, and had served as an Administrative Judge for the Atomic Safety and Licensing Board, United States Nuclear Regulatory Commission. In 2013, he was appointed by the President of the United States to the Defense Nuclear Facilities Safety Board. Dr. Mossman died suddenly in January of 2014. He was known for his research into the biological effects of low-level radiation, radiological risk assessment and risk management, and radiation protection and public policy.