Dan Akerson poses for a portrait at the General Motors headquarters in Detroit, Michigan, in this August 31, 2010 handout picture. General Motors Co on December 10, 2013 said Chief Executive Dan ... more 
Dan Akerson poses for a portrait at the General Motors headquarters in Detroit, Michigan, in this August 31, 2010 handout picture. General Motors Co on December 10, 2013 said Chief Executive Dan Akerson will step down next month and be replaced by Mary Barra, the company's global product development chief, marking the first time a major U.S. automaker has been led by a woman. REUTERS/John F. Martin/General Motors/Handout via Reuters/Files (UNITED STATES - Tags: BUSINESS TRANSPORT) ATTENTION EDITORS - THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS less 
1 / 6
Reuters | Photo By HANDOUT / REUTERS
Tue, Dec 10, 2013 10:42 AM EST