At SpaceX, Musk oversees the development of rockets and spacecraft for missions to Earth orbit and ultimately to other planets. In 2008, SpaceX’s Falcon 9 rocket and Dragon spacecraft won the NASA contract to provide cargo transport to space. In 2012, SpaceX became the first commercial company to dock with the International Space Station and return cargo to Earth with the Dragon.

At Tesla, Musk has overseen product development and design from the beginning, including the all-electric Tesla Roadster, Model S and Model X, and the rollout of Supercharger stations to keep the cars juiced up. (Some of the charging stations use solar energy systems from SolarCity, of which Musk is the non-executive chair.) Transitioning to a sustainable energy economy, in which electric vehicles play a pivotal role, has been one of his central interests for almost two decades. Before this, he co-founded PayPal and served as the company's chair and CEO.