Andrew Exum is a senior fellow at the Center for a New American Security and teaches a course in low-intensity conflict at Columbia University's School of International and Public Affairs. From 2000 until 2004, Exum served on active duty in the U.S. Army. He served as an adviser to Gen. Stanley McChrystal in Afghanistan in 2009 and subsequently participated in an assesment conducted for Gen. David Petraeus in 2010. He holds a doctorate in war studies from the University of London. Exum blogs at Abu Muqawama. His WPR column, Abu Muqawama, ran from March to August 2012.