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. 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.