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 News" on September 2, 1963, when the show was expanded from 15 to 30 minutes, making Cronkite the anchor of American network television's first nightly half-hour news program. Cronkite's tenure as anchor of the "CBS Evening News" made him an icon in television news. During the early part of his tenure anchoring the "CBS Evening News", Cronkite competed against NBC's anchor team of Chet Huntley and David Brinkley, who anchored the "Huntley-Brinkley Report". For much of the 1960s, the "Huntley-Brinkley Report" had more viewers than Cronkite's broadcast. A key moment for Cronkite came during his coverage of John F. Kennedy's