Mitchell served as a U.S. Senator and in the U.S. Army Counterintelligence Corps.
- Chairman, DLA Piper
- Chairman Emeritus. International Crisis Group
- Member, Task Force on the United Nations
- Disney chairman of the board, 2004-7
- Deutsche Bank Trust Company Americas member of the 'Client Advisory Board' from 2007
- British American Project - Patron
- Senior advisor, Teneo