Marshall is a doctoral student in the Genetics Graduate Interdisciplinary Program. Originally from the Appalachian Mountains in Georgia, he graduated from Vassar College with a bachelor’s in general biology. He is currently working on projects with researchers at NASA Ames, the Mars Society, and the American Society for Gravitational and Space Research. His experiences include analyzing data from International Space Station biology experiments, advocating for space research to congressional offices, and organizing events with speakers in the space industry. His research interests include astrobiology, analog research, extreme environment biology, space advocacy, and science education and outreach. At Arizona, his research will focus on the metabolism of trace gases by microorganisms.