Ban Ki-moon was the eighth Secretary-General of the United Nations from January 2007 to December 2016. Before becoming Secretary-General, Ban was a career diplomat in South Korea's Ministry of Foreign Affairs and in the United Nations.

Ban was the foreign minister of South Korea from January 2004 to November 2006. In February 2006 he began to campaign for the office of Secretary-General. As foreign minister of South Korea he was able to travel to all the countries on the United Nations Security Council, a maneuver that turned him into the campaign's front runner.

On 13 October 2006, he was elected to be the eighth Secretary-General by the United Nations General Assembly. On 1 January 2007, he succeeded Kofi Annan. As Secretary-General, he was responsible for several major reforms on peacekeeping and UN employment practices. Diplomatically, Ban has taken particularly strong views on global warming, pressing the issue repeatedly with U.S. President George W. Bush, and on the Darfur conflict, where he helped persuade Sudanese president to allow peacekeeping troops to enter Sudan.

Ban was named the world's 32nd most powerful person by the Forbes list of The World's Most Powerful People in 2013, the highest among South Koreans. In 2016, Foreign Policy named Ban one of the Top 100 Global Thinkers for his achievement of making the Paris Agreement a legally binding treaty less than a year after it was adopted.

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