During his thirty five year career in the United Nations Gustave Feissel was involved in diplomacy related to both economic and political issues. On the political side, he was involved at the highest level of conflict resolution and peacekeeping. Beginning in 1984 one of his principal responsibilities was the Cyprus problem. From 1993 to 1998 he was Chief of Mission of the United Nations Operations in Cyprus. His graduate studies were at New York University and Sciences Po. He is a member of the Council of Foreign Relations.