Simpson Aerospace is the engineering practice of Dr. Christopher R. Simpson, focused on propulsion, state estimation, and astrodynamics. Its guiding principle, “Engineering with intent. Built to light,” reflects a body of work centered on research, published writing, open tools, and technical education. The practice explores advanced propulsion and combustion topics, including rotating detonation engines, scramjets, combined-cycle systems, combustion stability, and alternative fuels. It also investigates state estimation and mission planning for responsive launches of small-satellite constellations, drawing on theoretical study, published literature, and openly available code.

Simpson Aerospace offers instructor-led short courses, with a complete Orbit Determination course available online. Courses on hypersonic propulsion, combustion stability, detonation, and shock tubes are in development. Its open engineering tools include On-Demand Launch mission planning, ground-station development through the SatNOGS network, and trajectory and launch-window resources. The site also shares articles on orbital mechanics and responsive constellation launch planning, alongside research and educational materials for people interested in aerospace engineering.