 For the 1936 World Series he was named one of three official scorers, a rotating honor within the profession.Each year he then switched to the New York Giants football team for its season with similar travel to games and bowls.Rennie was a prolific freelance contributor of sports and general interest articles as well as short stories and poems to numerous magazines, prominently "Collier's", "The Saturday Evening Post", "Sports Illustrated", "Life", "Reader's Digest", "Argosy", "Cosmopolitan", and "American Legion Monthly".