Vali Nasr is the dean of the Johns Hopkins University Paul H. Nitze School of Advanced International Studies and a contributor at the Bloomberg View. Nasr served as senior advisor to the US special representative for Afghanistan and Pakistan, Ambassador Richard Holbrooke, between 2009 and 2011. He is the author of the books The Dispensable Nation, Forces of Fortune and The Shia Revival. On Twitter: @vali_nasr