Dr. Leonard, after leaving the US Air Force following the Korean War, returned to North Carolina State University and received his MS and PhD in Nuclear Engineering. His PhD there was in neutron propagation in the atmosphere from neutron bursts and hence was able to do his post-graduate work, nuclear weapons related research, at the DOD Armed Forces Radio-biology Research institute. At Catholic University of America he taught courses in radiobiology and radiology and later provided consulting at nuclear power plants in radiation safety and radiation protection. He has developed analytical models for radiation cellular DNA damage and repair. These models have provided biophysical insight into the dynamics of cellular damage and repair from ionizing radiation and he has published over 50 papers in this area through the Radiation Research Society, the Health Physics Society, the American Nuclear Society and the International Journal of Radiation Biology. Arthur Lucas was educated in physics starting in 1949 and has spent a life working in the development of instrumentation for the measurement of radiation from x-ray generators, particle accelerators, nuclear reactors and nuclear weapons. His work has spread across the many facets of the protection of workers in the radiation environs, working in large corporate, military and governmental organizations. He is now in retirement working as an adjunct professor of physics at the Oklahoma State University. In that position he has become active in both observational astronomy and astromechanics, as well as continuing his activity in radiation safety and medical physics.