مصرف لبنان
Haddad began his banking career at Société Générale in Beirut. From 1979 to 1981 he worked as advisor to the governor of the Banque du Liban, Lebanon's central bank, and taught economics at the American University of Beirut. In 1981, he began to work at the International Finance Corporation (IFC), part of the World Bank Group, in several positions, including director of the Middle East and North Africa regions based in Cairo.