AT&T CEO Sigman out, de la Vega in

Things really do come in threes: Days after the exits of Sprint Nextel CEO Gary Forsee and Jamba/Fox Mobile Entertainment head Lucy Hood, AT&T's president and CEO of wireless Stan Sigman announced his retirement Thursday, effective immediately. AT&T named COO Ralph de la Vega to fill Sigman's vacancy--de la Vega had been considered a front runner to replace Forsee at the helm of Sprint. A 42-year AT&T veteran, Sigman exits months after negotiating exclusive U.S. rights to Apple's iPhone--he was named president and CEO of the former Cingular Wireless in 2002 following the merger of SBC Communications and BellSouth.

For more on Sigman's resignation:
- read this CNNMoney article

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