What's in Store for Mary T. Barra at General Motors?

In this handout image provided by General Motors, The first pre-production Chevrolet Volt is on the assembly line at the Detroit-Hamtramck manufacturing plant March 31, 2010 in Detroit, Michigan.
( John F. Martin/General Motors (via Getty Images) )

Produced by Mythili Rao

Produced by PRI and WNYC