Koutsis is a career member of the Senior Foreign Service, class of Minister Counselor. His diplomatic career has involve roles as the Director of the Office of the Special Envoy for Sudan and South Sudan, Deputy Chief of Mission in Ouagadougou, Burkina Faso, and Deputy Director in the Office of Central African Affairs. Prior assignments include service as Team Leader of the Provincial Reconstruction Team in Diyala Province, Iraq, Political and Economic Counselor in Monrovia, Liberia, and Deputy Chief of Mission in Nouakchott, Mauritania. Most recently, from 2016 to 2019, he served as the Charge d’Affaires of the United States Embassy in Khartoum, Sudan. Koutsis became Chargé d’Affaires for Guinea in September 2020.
