He's been under fire for a year over disappointing results
                                
                                
                                    (Newser) -
                                    Motorola's besieged CEO, Edward J. Zander, will step down at the end of the year, the Wall Street Journal reports. Zander, who has been under fire from investors for a year for sluggish growth, will be replaced by current president Greg Brown. Motorola's shares rose in response to the news.