Westin said Chang "has distinguished herself covering the news of every sort, from national and world events to the everyday experiences of parents and families."
Chang was awarded an Emmy for her breaking news coverage of California wildfires and had previously won a Gracie award for a "20/20" story on "Women and Science," a profile of transgender neurobiologist Ben Barres. Other stories include an hour-long look at the long-term impact of foreign adoptions through the eyes of one American family and an inspirational advocate who champions the cause.
She also has a blog on ABCNews.com, called "Juju Juggles," about work, motherhood and the madness of everyday living.
Chang joined ABC News in 1991, and her previous assignments at the network include anchoring "World News Now" and "World News This Morning" and reporting for "World News Tonight."
Born in Seoul, South Korea, Chang graduated with honors from Stanford University, with a bachelor of arts degree in political science and communications. At Stanford, she was awarded the Edwin Cotrell Political Science Prize. She is married to Neal Shapiro and has three sons.
Sam Champion will continue as the weather anchor for "Good Morning America."
"Sam Champion brings his knowledge and enthusiasm to weather, climate and the environment," Westin said.
In addition to covering the national forecast, Champion frequently travels to weather-related stories around the country and the globe. Since joining "GMA" in 2006, he has reported from the frontlines of wildfires in California; from the scene of hurricanes in Florida, Texas and Louisiana; and from winter storm systems in Denver, Chicago and Boston. As part of the morning broadcast's "The New 7 Wonders of the World" series, Champion broadcast live afloat a raft in the middle of the Polar Ice Caps.
Champion is also at the forefront of reporting on the environment and climate change. In 2007, he traveled to Paris for the release of a groundbreaking report on global warming by the Intergovernmental Panel on Climate Change (IPCC). He regularly brings tips and information on how to be environmentally efficient and aware with his regular "Just One Thing" reports.
Since joining "GMA" in 2006 as the news anchor, Cuomo has reported live from the field on almost all major breaking news stories, including Hurricanes Katrina and Rita, the school shootings in Pennsylvania and at Virginia Tech, the Fort Hood massacre and the Sago mine collapse in West Virginia.
Cuomo, 39, also played a role in "Good Morning America's" coverage of the 2008 presidential election, reporting live throughout the major primaries and the general election, as well as interviewing the major candidates.
During the Sept. 11, 2001, World Trade Center attacks, Cuomo was one of the first reporters on the scene and has covered the resulting war on terrorism from Iraq, Turkey, Pakistan and other regional sites.
He reported live from Baghdad, Iraq, shortly after experiencing a massive IED attack. His latest international trip to Egypt included covering the expectations and reaction of the Muslim world surrounding Obama's visit.
Cuomo's investigative reporting has included such subjects as national drug issues, medical insurance scams, prescription drugs and the Duke University lacrosse scandal.