Rense moved to Los Angeles after World War II and joined the original Los Angeles Daily News, one of four downtown Los Angeles newspapers (calling itself "the only Democratic newspaper west of the Rockies") as a sportswriter. He covered all sports, from young UCLA basketball coach John Wooden's Bruins to the then-new Los Angeles Rams football team, including their 1951 world championship. In 1954, after the Daily News folded, he joined United Press as a reporter, and in 1957 published and edited a magazine group that included "The Art Rense Sports Book: Professional Football", the first magazine devoted exclusively to professional football.

Between 1959 and 1974 Rense handled public relations for the Douglas Aircraft Company, Missiles and Space division (pre-McDonnell-Douglas). In the mid-1970s Rense became public relations specialist for Harvey Mudd College, and later collaborated with football player Tom Harmon on Tom Harmon's Football Today in Las Vegas. After that, Rense worked on public relations for hotels in Las Vegas owned by the Summa Corporation, mainly the Desert Inn. He was a lifelong poet by avocation.

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