Steven P. Chappell, PhD, is an American aerospace engineer. He is a Technical Lead & Research Specialist for Wyle Integrated Science & Engineering at NASA's Johnson Space Center (JSC) in Houston, Texas. He is helping to define and execute the research needed to optimize human performance in next-generation spacesuits and extra-vehicular activity (EVA) systems. Chappell served as an aquanaut on the NASA Extreme Environment Mission Operations 14 (NEEMO 14) crew.