Las Vegas, US: Motorola CEO Ed Zander gives his keynote address at the Consumer Electronics Show in Las Vegas, Nevada. Motorola said Zander was stepping down as the US mobile phone maker faces shrinking market share amid stiff global competition. Motorola named Greg Brown, 47, currently the companyصs president and chief operating officer, as CEO. Brown, a veteran of high-tech companies, joined Motorola in 2003.