AT&T Wireless on Wednesday named G. Michael Sievert as executive vice president and chief marketing officer. Sievert will oversee the company's marketing efforts for AT&T Wireless' voice and data divisions. The position is a new one for AT&T Wireless. The company had previously divided marketing duties among several different departments and employees, a representative said. Sievert comes to AT&T Wireless from E*Trade Financial, where he was chief marketing and sales officer.