AT&T

(T) - Get Report

said its president, David Dorman, will replace Michael Armstrong as chairman and chief executive when the company completes the sale of AT&T Broadband to

Comcast

(CMCSK)

.

Dorman, 48, joined AT&T as president in December 2000. He has had responsibility for the operations of the company's core business and consumer services units, including network services, international ventures and AT&T Labs.

Prior to being named president of AT&T, Dorman was CEO of Concert, the joint venture run by AT&T and

British Telecom

, part of

BT Group

(BTY)

. Prior to that he headed PointCast, an Internet news service, and was chief executive of Pacific Bell.

As previously announced, Armstrong, who has been AT&T's CEO since October 1997, will leave AT&T once the Comcast deal is completed to become chairman of AT&T Comcast. Armstrong, 64, was scheduled to retire from AT&T in 2003.

Shareholders of AT&T and Comcast approved the merger plan earlier this month, and the deal should be completed by the end of the year.

AT&T, a member of the

Dow Jones Industrial Average

, was recently trading up 21 cents to $10.40 on the

New York Stock Exchange

.