The transfer of power is complete. Tonight, Diane Sawyer assumed the anchor chair for ABC’s News replacing the retired Charles Gibson

ABC's selection of George Stephanopoulos to replace Diane Sawyer on Good Morning America signals the network's desire to toughen up the morning show during tough times.

It's the first time the reporter, who turns 64 on Dec. 22, has publicly addressed her departure, which has made headlines for weeks. Sawyer joined GMA in '99 as a temporary gig but stayed on because of high ratings.

Diane Sawyer will succeed her friend and former partner Charlie Gibson as the anchor of ABC's "World News" in January, making her the second woman to assume the prestigious chair at a network newscast.