David Jason Muir (born November 8, 1973) 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 primary substitute anchor on ABC's World News Tonight 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. According to the Tyndall Report, Muir's news reporting received the most airtime in 2012 and 2013, making him one of the most visible journalists in America. World News Tonight with David Muir has become the most watched newscast in the United States of America. In 2013, TV Week called him one of the "12 to Watch in TV News". Muir was listed as one of People Magazine's Sexiest Men Alive in 2014.