Buick, GMC boss Richards quits after 8 days; Dewar to leave GM
The brand heads of Buick-GMC and Chevrolet are leaving General Motors Co., continuing a management upheaval sparked by the Dec. 1 ouster of CEO Fritz Henderson. Buick-GMC head Michael Richards, who left Ford Motor Co. in 2008, has quit eight days after joining GM, according to a source with direct knowledge of the situation. Brent Dewar, who was appointed in July to steer Chevrolet, has elected to leave GM within four months. He is succeeded by James Campbel
