Zach Vertin was a nonresident fellow in the Brookings Foreign Policy program and was previously a visiting fellow at the Brookings Doha Center. He was also a lecturer of public and international affairs at Princeton University. His areas of expertise include U.S. foreign policy, multilateral diplomacy, conflict, mediation and political transitions. His recent work focuses on the Arabian Peninsula, the Horn of Africa, and the changing geopolitics of the Red Sea. He is currently serving in the Biden administration as senior advisor to the ambassador-designate to the United Nations .