In the furor over the disclosures of former National Security Agency contractor Edward Snowden, much of the focus has been on former Guardian blogger Glenn Greenwald and, to a far lesser extent, filmmaker Laura Poitras. But Snowden also confided in Barton Gellman of the Washington Post. From Snowden's documents, Gellman, a two-time winner of the Pulitzer Prize, co-wrote with Poitras the story that revealed the existence of NSA's PRISM program, which mines data from the world's biggest Internet companies. Gellman appears today as one half of an expert panel titled "Leakers or Whistleblowers? National Security Reporting in the Digital Age." While perhaps shedding light on the question of whether "leaker" and "whistleblower" are mutually exclusive, the event also features former NSA and CIA director General Michael Hayden (Ret.), USAF. Despite the extreme spookiness of his résumé, Hayden is a practiced, genial presence in public, and is happy to defend America's espionage practices. He was even spotted on a commuter Acela train recently, and a lefty passenger eavesdropped on him giving "off the record" phone interviews (and live-tweeted it, of course). Hayden then posed for a photo with the eavesdropper. Perhaps he'll pose for photos with you, too. The discussion begins at 6 p.m. in Fleischman Commons, which, frankly, seems to be on the small side for the crowd this event might generate.