Halty has served as a consultant for various international organizations in more than 40 countries. As a consultant for the IDB, the World Bank, USAID, and IDRC, he has worked on issues related to the development of micro and small enterprises in Argentina, Brazil, Chile, Paraguay, Bolivia, Peru, Colombia, Venezuela, Ecuador, Guyana, El Salvador, Guatemala, Santo Domingo, Jamaica, Mexico, and Ukraine. Since 1993, he has worked with the IOM and the UNDP on the development and management of programmes , primarily focusing on the disarmament, demobilization, and reintegration of former combatants, as well as the reduction of armed violence. He designed and directed programmes in Mozambique, the Republic of the Congo, the Central African Republic, Somalia, the Solomon Islands, Macedonia, and Sudan, and worked as a consultant in Liberia, the Democratic Republic of the Congo, Niger, Ivory Coast, the Comoros, Papua New Guinea, the Philippines, Colombia, and Iraq.