Question: Which director worked in more countries, Robert Butler or Bob Clark? 
Sentence (from "Bob Clark"): Although he worked primarily in the United States, from 1973 to 1983 he worked in Canada and was responsible for some of the most successful films in Canadian film history such as "Black Christmas" (1974), "Murder by Decree" (1979), "Tribute" (1980), and "Porky's" (1982).
Relevant evidence: Yes