ADAM STELTZNER is an engineer at the Jet Propulsion Laboratory. He worked on several flight missions, including Galileo, Cassini, and Mars Pathfinder, and the Mars Exploration Rover project. He was the phase lead and development manager for the Mars Science Laboratory and the Curiosity rover’s Entry, Descent, and Landing phase; he also helped design, build, and test the Sky Crane landing system. He lives in Pasadena, California.