Arnold Zenker Arnold Zenker Associates in Boston, which trains "people to successfully master the public spotlight." Arnold Zenker Arnold L. Zenker (born 1938) is a retired media broadcaster and public appearance counselor who gained brief stardom by sitting in for Walter Cronkite on the "CBS Evening News" in 1967. Zenker studied at the University of Pennsylvania in Philadelphia, from which he received an undergraduate and a law degree. In 1967 at the age of 28, he was asked to sit in for anchor Walter Cronkite to deliver the nightly news. Zenker, working as a Manager of News Programming at CBS at the
Walter Cronkite he ended the newscast with opinion or commentary. Beginning with January 16, 1980, Day 50 of the Iran hostage crisis, Cronkite added the length of the hostages' captivity to the show's closing in order to remind the audience of the unresolved situation, ending only on Day 444, January 20, 1981. Cronkite is vividly remembered for breaking the news of the Assassination of John F. Kennedy on Friday, November 22, 1963. Cronkite had been standing at the United Press International wire machine in the CBS newsroom as the bulletin of the President's shooting broke and he clamored to get on the