Many of the most successful CEOs we studied, such as Microsoftâs Satya Nadella, worked their whole career in one industry. Many also worked at one company for most of their career, as was also true for Nadella: he joined Microsoft after two years in his first job as an engineer for Sun Microsystems. GM CEO Mary Barra, who achieved the breakthrough feat of becoming the first woman appointed to lead one of the Big Three US car manufacturers, worked only at General Motors over the course of thirty-three years before her leap to CEO in 2013. She started working for GM, inspecting hoods and fenders at a Pontiac factory, even before she graduated from college. And she earned her undergraduate degree in electrical engineering from General Motors Institute (which later became Kettering University).