This year NATO celebrates seventy-five years of collective defense, expanding from twelve founding members in 1949 to thirty-two today.  Panelists discuss the evolution of NATO as it has sought to adapt to geopolitical shifts throughout the years, the challenges it faces in responding to global threats today, and the role of NATO in the future. For those attending virtually, log-in information and instructions on how to participate during the question and answer portion will be provided the evening before the event to those who register. Please note the audio, video, and transcript of this hybrid meeting will be posted on the CFR website.