"How did the U.S. lose the war in Afghanistan? Who bears responsibility? What has been the human cost?" These are the questions asked on Frontline's website advertising the 3-part documentary series "America and the Taliban." These hour-long documentaries, which are available for streaming online, were produced and directed by Martin Smith and Marcela Gaviria. Because of his on-screen appearances, Mr. Smith is better known by the public. From the other side of the duo, here's a conversation with Marcela Gaviria, who has produced over 40 hours of programming with Frontline.  

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