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 events that alter and illuminate our times ... and you were there." In 1971, the show was revived and redesigned to attract an audience of teenagers and young adults, hosted again by Cronkite on Saturday mornings. In 1957, he began hosting "The Twentieth Century" (eventually renamed "The 20th Century"), a documentary series about important historical events of the century composed almost exclusively of newsreel footage and interviews. A long-running hit, the show was again renamed as "The 21st Century" in 1967 with Cronkite hosting speculative reporting on the future for another three years. Cronkite also hosted "It's News to Me",