The former Today anchor will act as a special correspondent for the primetime news show, and will also contribute to Today, NBC Nightly News and the network's other news programs. Vieira will also cover the 2012 London Olympic Games.
"From the day that Meredith joined us at NBC News, we knew she was family," said NBC News President Steve Capus. "Meredith's immeasurable talents reach beyond the newsroom to connect with the extraordinary people she interviews as well as the viewers at home. She is as genuine as you can get, a world-class journalist and a captivating storyteller. These skills will be hugely beneficial to Rock Center with Brian Williams and across NBC News."