As head of HBO Documentary Films since 1979, Sheila Nevins has exerted more influence on the medium than perhaps anyone in its history. She has overseen the production of literally hundreds of documentaries, which have won dozens of Oscars. Whether shot in a war zone or the back of a taxi, Sheila Nevins’ productions are powerful, brazen, and unflinchingly honest. But when it comes to telling her own story, truth gets trickier. As she explains to Here’s The Thing host Alec Baldwin, in her new book, You Don’t Look Your Age and Other Fairy Tales, Sheila Nevins blends fiction and reality.