First known to the American public as a correspondent for CBS News, Hart eventually became anchor of CBS Morning News program, broadcast from 1969 until 1973.AP (March 18, 1988) "Veteran Newsman John Hart Leaving NBC." Hart moved to NBC in 1975 where, in addition to general correspondent duties, he served as a substitute for John Chancellor as anchor of NBC Nightly News and anchor of NBC Nightly News weekend editions during much of the 1970s. He stayed with that network until 1988, when The Christian Science Monitor hired him as anchor of its cable television newscast, World Monitor, which aired on The Discovery Channel 1988–1991. He retired in 1991.
