From the time he first sat behind the anchor desk in 1962 to his final broadcast in 1982, Walter Cronkite became the most iconic figure in broadcast news. Although trailing Huntley-Brinkley in the ratings throughout most of his first six years as anchor, Cronkite quickly rose to become both the face of CBS News and also becoming one of the most trusted men in America.
From the JFK assassination in 1963 and the ensuing social unrest and Vietnam War in the 1960s to the lunar landing in 1969, Cronkite was the face of some of the most iconic moments in TV news history.
There are loads of great bios of Cronkite on the web. Some suggested links:
CBS News provided a retrospective on the CBS Evening News on the day he died in 2009: