David Jason Muir is an American journalist and the anchor of ABC World News Tonight and co-anchor of the ABC News magazine 20/20, part of the news department of the ABC broadcast-television network, based in New York City. Muir previously served as the weekend anchor and principal substitute anchor on ABC's World News with Diane Sawyer, subsequently succeeding her on September 1, 2014. At ABC News, Muir has won multiple Emmy and Edward R. Murrow awards for his national and international journalism.
