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 assignments. During this time he also covered the Nuremberg war crimes trial serving as the chief of the United Press bureau in Moscow. The main content of the papers documents Cronkite's career with CBS News between 1950 and 1981. The Cronkite Papers assemble a variety of interviews with U.S. presidents, including Herbert Hoover, Harry Truman, and Ronald Reagan. President Lyndon Johnson requested a special interview with Cronkite while he was broadcasting live on CBS. Between 1990 and 1993, Don Carleton, executive director for the Center for American History, assisted Cronkite as he compiled an oral history to write his autobiography,