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Chargé d’Affaires
Official portrait

Chargé d’Affaires Mark S. Dieker

Mark S. Dieker
Chargé d’Affaires
U.S. Embassy in Bandar Seri Begawan

Mark S. Dieker is the Chargé d’Affaires of the U.S. Embassy in Bandar Seri Begawan, Brunei Darussalam. He began his assignment in Brunei as the Deputy Chief of Mission in July 2014. He is a career member of the U.S. Foreign Service with more than fifteen years of experience working and studying in Asia, Africa and Europe.

Previously, Mark served in the State Department's Bureau of Political-Military Affairs, where he led a team of Foreign Service officers, military officers, and civil servants to oversee tens of billions of dollars in U.S. arms transfers to countries in the Asia-Pacific region. His previous overseas assignments were at the U.S. Consulate in Fukuoka, Japan (2009-2012), the American Institute in Taipei, Taiwan (2006-2008), the U.S. Embassy in Pretoria, South Africa (2003-2005), the U.S. Embassy in Tokyo, Japan (2001-2003), and the U.S. Embassy in London, United Kingdom (1993).

Mark earned a bachelor's degree from Miami University, in his home state of Ohio, and a master's degree from the University of Tokyo Graduate Schools of Law and Politics. While a student, he interned at the White House and the U.S. Congress. His first job after college was teaching English in Japan as part of the Japan Exchange and Teaching (JET) Program.

Mark has published articles on a variety of topics, including U.S. diplomatic initiatives in the countries he has served. He composed "The March of the Foreign Service," a Marine band version of which can be viewed on YouTube. He is the recipient of the State Department's Superior Honor and Meritorious Honor awards.