I am a senior astrophysicist at the Smithsonian Institution studying supernovae and supernova remnants. I have an active research program in theoretical and observational aspects of supernova evolution and cosmic chemical evolution. Additionally, I serve as the instrument scientist for the Chandra X-ray Observatory High Resolution Camera, and am the Deputy Instrument Scientist for the ExCEED MIDEX mission concept. I am the PI for the Lunar Extreme Ultraviolet Observatory instrument concept.