For the inaugural session of our new Main Line Briefings, hosted and cosponsored by The Haverford School, we are pleased to feature an in-depth conversation between Drs. Marisa Porges (Head of The Baldwin School) and John Nagl (Headmaster of The Haverford School). By coincidence, the two heads of these prestigious private schools on the Main Line are also military veterans and experienced hands in the field of national security. They will be discussing the current threats to American national security, covering challenges from state and non-state actors, such as China, Russia, Iran, and various terrorist movements, as well as the potential battlefields of the 21st Century from conventional war to cyber war and beyond.