"I'm pleased to announce that beginning Monday Dec. 14, our new anchor team at 'Good Morning America' will be in place and on the air," Westin said in an e-mail to the ABC News staff.
Stephanopoulos will anchor the broadcast with Robin Roberts and replaces Diane Sawyer, who will become the new anchor of "World News" beginning Dec. 21. Juju Chang has been named the news anchor for "Good Morning America" and Chris Cuomo has been promoted to co-anchor of "20/20" alongside Elizabeth Vargas. Cuomo has also been named ABC News' chief law and justice correspondent, reporting for all broadcasts and platforms across the news division. Sam Champion will remain the weather anchor on the morning show.
"In putting this new 'GMA' team together, we've pursued one goal," Westin said. "How can we best serve our audience? How can we bring them what matters most to them -- the day's important news, engaging stories, useful information and real expertise to help them improve their lives?"
"Robin and George are the right pair to lead our effort," Westin said. "As we've seen over time, Robin brings a warmth and intelligence to the morning that no one can match. Hers is a practical curiosity that brings the viewers' questions to the fore. George complements Robin's strengths with a deep knowledge of and commitment to news about the nation and the world." (Click here to read Westin's full e-mail.)
"I can't wait to join 'Good Morning America's' amazing team, and serve its loyal viewers," Stephanopoulos said. "No one can replace Diane Sawyer, but I'll do everything I can to match her unquenchable curiosity and intense commitment to informing the country every morning. What an adventure."
Stephanopoulos, 48, has been ABC News' chief Washington correspondent since December 2005 and host of ABC's Sunday morning political affairs program, "This Week With George Stephanopoulos," since September 2002. He will take on the role of chief political correspondent and continue to anchor "This Week" until a replacement is named, Westin said.
"I am so excited to welcome George and Juju to our family," Robin Roberts said. "The energy and talent of those on camera and behind the scenes at this program are second to none. I have no doubt that George and Juju will immediately feel right at home. Saying goodbye to Diane has not been easy, but I'm glad she will finally be getting more sleep."
In his role as anchor of "This Week," Stephanopoulos has interviewed President Obama, Vice President Joe Biden, Secretary of State Hillary Clinton, Treasury Secretary Timothy Geithner, as well as other key members of the Obama administration.
During the previous administration, he interviewed every key member of the Bush administration, and throughout the 2008 presidential race he routinely sat down with candidates on the campaign trail and moderated Republican and Democratic debates.
"George is a formidable interviewer who brings the viewer a deeper understanding of the great issues of the day," Westin said.
Stephanopoulos has conducted several exclusive interviews with international leaders, including Iranian President Mahmoud Ahmadinejad in April 2009, former British Prime Minister Tony Blair, former Canadian Prime Minister Jean Chretien and former German Chancellor Gerhard Schroeder.