text:  General Motors embattled self-driving car division now has a new leader. Mark Whitten is the new CEO of Cruise. It comes as the autonomous vehicle company tries to recover from an incident this past October where an autonomous Chevy Bolt struck a pedestrian and dragged her under the car for about 20 feet. That led to the ouster of several executives and an internal probe that found culture issues and management ineptitude contributed to the crash.