Doss has served the United Nations on a variety of capacities. His earlier work within the Organization include assignments in China, Kenya, Niger, Democratic Republic of the Congo (formerly Zaire) and Benin.
Later on, he acted as United Nations Resident Coordinator and UNDP Regional Representative in Bangkok. In the meantime, he was Director of the United Nations Border Relief Operation, in charge of United Nations assistance to displaced Cambodians on the Thai-Cambodia border.
In addition, he also served as Director of the United Nations Development Group (UNDG). Before working for the UNDG, he was Director of the UNDP European Office in Geneva, in charge of strengthening the UNDP’s outreach and liaison work in Western Europe.
His recent appointments include as Principal Deputy Special Representative of the Secretary-General for Côte d'Ivoire in June 2004. Previously, he was the Deputy Special Representative of the Secretary-General for Sierra Leone, while concurrently serving as United Nations Resident Coordinator, Humanitarian Coordinator and United Nations Development Programme (UNDP) Resident Representative.
Doss graduated from the London School of Economics.