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David Jason Muir (born November 8, 1973) is an American journalist and the anchor of ABC World News Tonight, the news department of the ABC broadcast-television David Muir Bio- David Muir (age, height, net worth, gay, dating, boyfriend, ABC news, family, education) is an American television journalist and presenter.The latest Tweets from David Muir (@DavidMuir). Anchor, ABC World News Tonight with David Muir; Co-Anchor, ’20/20′. New YorkDavid Muir is on Facebook. Join Facebook to connect with David Muir and others you may know. Facebook gives people the power to share and makes the worldEver since David Muir was tapped to replace Diane Sawyer when she leaves ABC World News in September, gossip about his sexual orientation has gone into overdrive David Muir is an Emmy-award winning journalist for ABC News. Muir is the anchor and managing editor of ABC World News Tonight with David Muir and co-anchor News anchor David Muir knew he wanted to be a journalist by the time he hit double digits. Around fifth grade, he began broadcasting from inside a cardboard box in “ABC World News Tonight” anchor David Muir is being nicknamed “Anchor Monster” by network staffers after repeatedly losing his temper with his crew over being David Muir, Writer: ABC Evening News. David Muir was born on November 8, 1973 in the USA as David J. Muir. He is an actor and writer, known for ABC World News Tonight Learn more about David Muir at TVGuide.com with exclusive news, full bio and filmography as well as photos, videos, and more.