"Edward Snowden chose three journalists to tell the stories in his Top Secret trove of NSA documents: Barton Gellman of The Washington Post, Glenn Greenwald of The Guardian and filmmaker Laura Poitras, all of whom would share the Pulitzer Prize for Public Service. Poitras went on to direct the Oscar-winning Citizenfour. Greenwald wrote an instant memoir and cast himself as a pugilist on Snowden's behalf. Gellman took his own path. Snowden and his documents were the beginning, not the end, of a story he had prepared his whole life to tell. More than 20 years as a top investigative journalist armed him with deep sources in national security and high technology. New sources reached out from government and industry, making contact on the same kinds of secret, anonymous channels that Snowden had used. Gellman's reporting unlocked new puzzles in the NSA archive. And as Snowden's revelations faded somewhat from the public consciousness, the machinations he exposed continue still, with many po