UN-Sonderbeauftragter
Previously, he acted as Assistant Secretary-General in the Department of Peacekeeping Operations starting March 1993. During this time, from 1996 to 1997, he also concurrently served as Special Representative of the Secretary-General and Chief of the United Nations Mission in Bosnia and Herzegovina (UNMIBH). Earlier, from 1991 to 1993, he was Special Representative of the Secretary-General and Chief of the United Nations Observer Mission in El Salvador (ONUSAL).