Panelists Tamir Pardo, former Director of the Mossad, and Michael Morell, former Director of the Central Intelligence Agency, joined moderator Graham Allison, Director of the Belfer Center for Science and International Affairs for a discussion on the global threat posed by Islamic extremist groups. The panelists discussed the evolving presence of the Islamic State in the Middle East as well as U.S. and Israeli efforts to mitigate the spread of ISIS.