3Q: Barry Posen on the NATO Summit and state of the alliance | 2018 | News 3Q: Barry Posen on the NATO Summit and state of the allianceMichelle English | Center for International StudiesJuly 20, 2018 Barry Posen, a leading national security expert and Cold War historian, offers in-depth scholarship on NATO Summit. He discusses the role of NATO today, and whether the alliance is “stronger than ever,” as President Trump stated in a post-summit press conference. home page photo: Laura Kerwin/MIT Center for International Studies