| 1969-1975 | FU - Freie Universität Berlin |
| 1971-1972 | LSE - London School of Economics, London, UK |
| 1977-1978 | ENA - Ecole Nationale de Administration, Paris, France |
| 1975-1976 | DIE - German Institute for Development |
| 1978-1980 | Junior Professional Officer, United Nations Development Programme, New York, USA |
| 1980-1982 | Programme Officer, United Nations Development Programme, Port-au-Price, Haiti |
| 1983-1987 | Assistant Resident Representative, United Nations Development Programme, Islamabad, Pakistan |
| 1987-1989 | Deputy Resident Representative, United Nations Development Programme, Tehran, Islamic Republic of Iran |
| 1988 | Special Mission through Afghanistan "SALAM 3" , United Nations |
| 1989-1991 | Chief of Mission, Operation Salaam, Kabul, Afghanistan |
| 1991-1992 | Special assignments for the Special Humanitarian Representative of the UN Secretary General for the Kuwait - Iraq conflict |
| 1992-1999 | United Nations Resident Coordinator, United Nations Development Programme, Tehran, Islamic Republic of Iran |
| 1995-1998 | Special missions in support of 6+2 Talks |
| 1998 | Special mission to Talibn-held Kandahar |
| 1999-2000 | Director for Operations and Analysis, UNODC - United Nations Drug Control Programme, Vienna, Austria |
| 2001-2002 | Special mission in support of the Special Representative of the Secretary General for Afghanistan |
| 2001-2005 | Director for Management and Finance, OSCE |
| 2003-2005 | Support to Martti Ahtisari’s ICT Initiative |
| 2005 | Special Mission to Somalia |
| 2005-2007 | Principle Deputy Special Representative of the Secretary General (DSRSG) for Political Affairs to Iraq |
| 2008 | Special mission to Afghanistan, ASG |
| Assistant Secretary General, Department for Political Affairs, New York, USA |
| 2008-2012 | Executive Representative of the Secretary-General for Sierra Leone, Freetown, Sierra Leone |
| since 2012 | Retired from the UN, various teaching engagements, published five papers on peacebuilding |
