2019-2022: Cabinet Secretary (Minister), Ministry of Sports, Culture and Heritage
2018-2019: Cabinet Secretary (Minister), Ministry of Education, Science, Technology and Innovation
2013-2018: Cabinet Secretary (Minister), Ministry of Foreign Affairs and International Trade
2011-2013: United Nations Assistant Secretary General and Deputy Executive Director, United Nations Environment Programme (UNEP)
2008- 2011: Permanent Secretary, Ministry of Justice, National Cohesion and Constitutional Affairs of the Republic of Kenya
Memberships:
- Member of the International Olympic Commission (IOC) Ethics
- Member of Advisory Board on UN Disarmament Matters (ABDM)
- Member of the Board of Trustees of the United Nations Institute of Disarmament Research (UNIDIR)
- Bibliotheca Alexandrina (BA) Board of Trustees (BoT).
- Member of the World Motor Sports Council (WMSC)
- Governor, the Board of Governors of the Commonwealth of Learning (CoL)
- Chancellor of International University of East Africa
- Patron of Ambassador Amina Leadership, Integrity, Values and Ethics (ALIVE) Foundation
- Chairman, Trade Negotiations & Investment Forum