Zach Vertin is an American writer, foreign policy expert, and former diplomat; he has spent the last twelve years working in international peace and conflict issues, not least in South Sudan. He is currently a Lecturer at Princeton University and a Visiting Fellow at the Brookings Institution's Doha Center. He previously served in the Obama Administration as a Senior Adviser to the U.S. Special Envoy to Sudan and Sudan South Sudan, and prior to that he was a Senior Analyst for the International Crisis Group. He has written or commented for: the New York Times, Washington Post, Wall Street Journal, Financial Times, Foreign Affairs, the Economist, the Atlantic, CNN, the BBC, and more. He lives in Washington, D.C.