John D. O’Connor is the San Francisco attorney who represented W. Mark Felt during his revelation as Deep Throat in 2005. O’Connor is the author of the new book, “Postgate: How the Washington Post Betrayed Deep Throat, Covered Up Watergate, and Began Today’s Partisan Advocacy Journalism,” the co-author of “Mark Felt: The Man Who Brought Down the White House” and is a producer of the 2017 film of the same name, written and directed by Peter Landesman.