Charles Thomas (Tom) McElroy is an academic specializing in space-based remote sensing and atmospheric science. His primary research focus is on monitoring Earth's atmosphere, with a particular emphasis on stratospheric ozone and the development of spectroscopic instrumentation techniques. McElroy has played a significant role in advancing the understanding of how atmospheric constituents influence the environment, notably through his co-invention of the Brewer Ozone Spectrophotometer, which has been deployed globally to measure ozone levels and UV radiation. He also co-developed the UV Index to help quantify the dangers of ozone depletion to public health. His innovative approach includes developing new methods for measuring and modeling the chemical composition of the atmosphere, contributing to educational advancements in the field. He invites graduate students to engage in cutting-edge research, pushing the boundaries of knowledge in planetary physics and experimental research in atmospheric monitoring.