A rebel group changed the course of Syria's long civil war when it seized Aleppo this past weekend. The Syria Report's Jihad Yazigi tells us what motivates the group's canny and mysterious leader.This episode was produced by Peter Balonon Rosen and Miles Bryan, edited by Matt Collette, fact-checked by Anouck Dussaud, engineered by Patrick Boyd and Rob Byers, and hosted by Noel King.Transcript at vox.com/today-explained-podcastSupport Today, Explained by becoming a Vox Member today: http://www.vox.com/membersA rebel fighter celebrates after they seized control of Aleppo, Syria this past weekend. Photo by Rami Alsayed/NurPhoto via Getty Images.Learn more about your ad choices. Visit podcastchoices.com/adchoices