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Jennings started his career early, hosting a Canadian radio show at age 9. He began his professional career with CJOH-TV in Ottawa during its early years, anchoring the local newscasts and hosting the teen dance show Saturday Date on Saturdays and then co-anchoring the CTV Television Network's national newscast. In 1965, ABC News tapped him to anchor its flagship evening news program. Critics and others in the television news business attacked his inexperience, making his job difficult. He became a foreign correspondent in 1968, reporting from the Middle East.
Jennings returned as one of World News Tonight's three anchormen in 1978, and he was promoted to sole anchorman in 1983. He was also known for his marathon coverage of breaking news stories, staying on the air for 15 hours or more to anchor the live broadcast of events such as the Gulf War in 1991, the millennium celebrations in 1999–2000, and the September 11 attacks in 2001. In addition to anchoring, he was the host of many ABC News special reports and moderator of several American presidential debates. He was always fascinated with the United States and became an American citizen in 2003.
