Career
Pellnäs started his studies in Karlstad in 1958 and then went on to serve as an officer in the Swedish Army. He served as head of the Norrbotten Regiment, head of battalion on Cyprus from 1983 to 1984, head of the United Nations Military Observers (UNMO) in Afghanistan from 1988 to 1989, head of the United Nations Military Observers on Balkan during the Yugoslav wars from 1992 to 1993, military advisor to David Owen and Thorvald Stoltenberg from 1993 to 1994, and head of the head of an international mission to monitor the Yugoslav-Bosnian border from 1994 to 1995 when he retired from the military. He later served as head of the Organization for Security and Co-operation in Europe mission office in Belgrade from 1998 to 1999.
Today, Pellnäs is an active commentator on defense policy and security issues in Sweden.