Errol Morris's relentless search for answers – philosophical, psychological, forensic – has led to a vast and ever-growing body of work that includes his celebrated documentaries, dozens of short films, weighty essays (and cognitive experiments) in the NY Times, books, actual criminal investigations and some pretty fetching commercials.The backstories are as interesting in some ways as the finished products, and Errol shared some of them with me in a very illuminating look at his career, his preoccupations and motivations.