Question: What nationality is the director of film A Closer Walk?
Sentence (from "Robert Bilheimer"): The executive director of the United Nations Office on Drugs and Crime, Antonio Maria Costa, asked Bilheimer to make the film human trafficking documentary film "Not My Life", and later said that he chose Bilheimer because of his "solid reputation [for] addressing difficult topics... combining artistic talent, a philosophical view about development and a humanitarian sentiment about what to do about the issues."
Relevant evidence: No