Ban Ki-moon (; Hangul: bangimun; Hanja: Pan Ji Wen ; Korean pronunciation: [pan.gi.mun]; born 13 June 1944) is a South Korean diplomat who 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. He entered diplomatic service the year he graduated from university, accepting his first post in New Delhi, India.

Ban was born on 13 June 1944 in the small farming village of Haengchi, Wonnam Township (-myeon), in Eumseong County, North Chungcheong Province in Korea. His family then moved to the nearby town of Chungju, where he grew up. During Ban's childhood, his father had a warehouse business, but the warehouse went bankrupt and the family lost its middle-class standard of living. When Ban was six, his family fled to a remote mountainside for much of the Korean War. After the war ended, his family returned to Chungju. Ban has said that, during this time, he met American soldiers. In secondary school (Chungju High School), Ban became a star student, particularly in his studies of the English language. In 1962, Ban won an essay contest sponsored by the Red Cross and earned a trip to the United States where he lived in San Francisco with a host family for several months. As part of the trip, Ban met U.S. President John F. Kennedy. When a journalist at the meeting asked Ban what he wanted to be when he grew up, he said, "I want to become a diplomat." He received a bachelor's degree in international relations from Seoul National University in 1970, and earned a Master of Public Administration from the John F. Kennedy School of Government at Harvard University in 1985. At Harvard, he studied under Joseph Nye, who remarked that Ban had "a rare combination of analytic clarity, humility and perseverance". Ban was awarded the degree of Doctor of Laws (Honoris Causa) by the University of Malta on 22 April 2009. He further received an honorary degree of Doctor of Laws from the University of Washington in October 2009, an honorary degree of Doctor of Law from the University of Cambridge in February 2016, and an Honorary Doctor of Humane Letters Degree from Loyola Marymount University in April 2016. On 30 August 2016, he was conferred the Honorary Doctor of Letters by National University of Singapore for his lifetime of service to humanity. In addition to his native Korean, Ban speaks English and French. According to a retired UN official, "one of Ban's biggest handicaps was his lack of fluency in English, which made it difficult for him to win over audiences in the US and elsewhere." There have also been questions, however, regarding the extent of his knowledge of French, one of the two working languages of the United Nations Secretariat. After graduating from university, Ban received the top score on Korea's foreign service exam. He joined the Ministry of Foreign Affairs in May 1970 and worked his way up the career ladder during the years of the Yusin Constitution. Ban's first overseas posting was to New Delhi, India, where he served as vice consul and impressed many of his superiors in the foreign ministry with his competence. Ban reportedly accepted a posting to India rather than the United States, because in India he would be able to save more money to send to his family. In 1974 he received his first posting to the United Nations, as First Secretary of the South Permanent Observer Mission (South Korea became a full UN member-state on 17 September 1991). After Park Chung-hee's 1979 assassination, Ban assumed the post of Director of the United Nations Division. In 1980 Ban became director of the United Nations' International Organizations and Treaties Bureau, headquartered in Seoul. He has been posted twice to the South Korean embassy in Washington, D.C. Between these two assignments he served as Director-General for American Affairs in 1990-92. In 1992, he became Vice Chairman of the South-North Joint Nuclear Control Commission, following the adoption by South and North Korea of the Joint Declaration of the Denuclearization of the Korean Peninsula. From 1993 to 1994 Ban was Korea's deputy ambassador to the United States. He was promoted to the position of Deputy Minister for Policy Planning and International Organizations in 1995 and then appointed National Security Advisor to the President in 1996. Ban's lengthy career overseas has been credited with helping him avoid South Korea's unforgiving political environment. Ban was appointed Ambassador to Austria and Slovenia in 1998, and a year later he was also elected as Chairman of the Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO PrepCom). During the negotiations, in what Ban considers the biggest blunder of his career, he included in a public letter a positive statement about the Anti-Ballistic Missile Treaty in 2001, not long after the United States had decided to abandon the treaty. To avoid anger from the United States, Ban was fired by President Kim Dae-jung, who also issued a public apology for Ban's statement. Ban was unemployed for the only time in his career and was expecting to receive an assignment to work in a remote and unimportant embassy. In 2001, during the 56th Session of the United Nations General Assembly, South Korea held the rotating presidency, and to Ban's surprise, he was selected to be the chief of staff to general assembly president Han Seung-soo. In 2003, incoming president Roh Moo-hyun selected Ban as one of his foreign policy advisors. When Ban became Secretary-General, The Economist listed the major challenges facing him in 2007: "rising nuclear demons in Iran and North Korea, a haemorrhaging wound in Darfur, unending violence in the Middle East, looming environmental disaster, escalating international terrorism, the proliferation of weapons of mass destruction, the spread of HIV/AIDS. And then the more parochial concerns, such as the largely unfinished business of the most sweeping attempt at reform in the UN's history". Before starting, Kofi Annan shared the story that when the first Secretary-General Trygve Lie left office, he told his successor, Dag Hammarskjold, "You are about to take over the most impossible job on earth". On 23 January 2007 Ban took office as the eighth Secretary-General of the United Nations. Ban's term as Secretary-General opened with a flap. At his first encounter with the press as Secretary-General on 2 January 2007, he refused to condemn the death penalty imposed on Saddam Hussein by the Iraqi High Tribunal, remarking, "The issue of capital punishment is for each and every member State to decide". Ban's statements contradicted long-standing United Nations opposition to the death penalty as a human-rights concern. He quickly clarified his stance in the case of Barzan al-Tikriti and Awad al-Bandar, two top officials who were convicted of the deaths of 148 Shia Muslims in the Iraqi village of Dujail in the 1980s. In a statement through his spokesperson on 6 January, he "strongly urged the Government of Iraq to grant a stay of execution to those whose death sentences may be carried out in the near future". On the broader issue, he told a Washington, D.C. audience on 16 January 2007 that he recognized and encouraged the "growing trend in international society, international law and domestic policies and practices to phase out eventually the death penalty". On the tenth anniversary of Khmer Rouge leader Pol Pot's death, 15 April 2008, Ban Ki-moon appealed for the senior leaders of the regime to be brought to justice. The Extraordinary Chambers in the Courts of Cambodia-tribunal, which was established by both the United Nations and Cambodia and which became operational in 2006, is expected to continue until at least 2010. Ban has received strong criticism from the UN Office of Internal Oversight Services (OIOS), which stated that the secretariat under Ban's leadership was "drifting into irrelevance".

why did he do that?
remarking, "The issue of capital punishment is for each and every member State to decide".