Before becoming Center for Humanitarian Health Director at John Hopkins Bloomberg School of Public Health, Dr. Speigel was the deputy director of the Division of Programme Management and Support Services for the United Nations High Commissioner for Refugees. Prior to joining the UN in 2002, he worked as a medical epidemiologist in the International Emergency and Refugee Health Branch at the Centers for Disease Control and Prevention. He has also worked as a medical coordinator with Médecins Sans Frontières and Médecins du Monde in refugee emergencies, as well as a consultant for numerous organizations.