VISIT CNBC.COMX Careers CareersGM's Mary Barra: This is what to study if you want a high-paying job in the future Marguerite Ward | @forwardist 47 Mins Ago Katie Kramer | CNBC Mary Barra, Chairman and CEO of General Motors. SHARES General Motors CEO Mary Barra has been working to overhaul the company, which employs more than 200,000 people, since taking...