韩博士担任大韩民国总理（2008-2009年）。 他曾是联合国秘书长的减少灾害风险和用水问题特使（2013-2018年），联合国/世界银行水事高级别小组特聘顾问（2016-2018年），联合国秘书长联合国水问题咨询委员会成员 水与卫生设施
（UNSGAB）（2007-2015），联合国秘书长气候变化问题特使（2007-2008），联合国秘书长全球可持续发展问题高级别小组（GSP）成员
（2010-2012） ），全球绿色增长研究所
（GGGI）创始主席（2010-2012），淡马锡国际小组成员（2004-2018）和渣打银行独立非执行董事（2010-2019）。
他曾担任联合国大会第56届会议主席（2001-2002），韩国外交部长
（2001-2002），副总理兼财政部长（1996-1997），总统办公厅主任
（ 1994-1995年），韩国驻美国大使（1993-1994年）和贸易和工业部长
（1988-1990年）。 他通过直接选举成为他的家乡江原道春川市的大韩民国国民议会三届议员（1988-1992，1996-2004）。
他目前是水和灾难高级专家和领导人小组（HELP）的主席（2007-），亚洲开发银行水咨询小组主席（2014-），马德里俱乐部会员和莫琳和麦克·曼斯菲尔德基金会国际顾问委员会成员，扎耶德可持续发展奖评审团副主席，国际金融（中国）论坛联合主席，浙江大学国际商学院特聘教授，中国人民银行国际货币研究所首席国际顾问，上海国际问题研究所顾问委员会成员，上海第一国际银行特别顾问，裕汉基金会董事会主席。 他还曾担任2014年平昌冬奥会竞标委员会主席。
1971年，他获得了第六届欧洲共同体奖（在欧洲预算的增长和功能方面的博士学位），并在2001年代表联合国获得了诺贝尔和平奖，并获得了荣誉奖。 2004年，他还被英国女王伊丽莎白二世（HM Queen Elizabeth II）授予了大英帝国骑士勋章（KBE），还以经合组织部长级会议主席身份出席了《绿色增长宣言》会议。
Dr. Han served as Prime Minister of Republic of Korea(2008-09). He was UN Secretary-General’s Special Envoy for Disaster Risk Reduction and Water(2013-18), Special Adviser to the UN/World Bank High-Level Panel on Water(2016-18), Member of the UN Secretary-General’s Advisory Board for Water and Sanitation(UNSGAB)(2007-15), Special Envoy of the UN Secretary-General on Climate Change(2007-08), Member of the UN Secretary-General’s High-Level Panel for Global Sustainability (GSP)(2010-12), Founding Chair of Global Green Growth Institute(GGGI)(2010-12), Temasek International Panel Member(2004-18) and Independent Non-Executive Director of Standard Chartered plc(2010-2019).
He was President of the 56th Session of the United Nations General Assembly(2001-02), Korea’s Minister of Foreign Affairs(2001-02), Deputy Prime Minister and Minister of Finance(1996-97), Chief of Staff to the President(1994-95), Korean Ambassador to the United States(1993-94) and Minister of Trade and Industry(1988-90). He was a three-term Member of Korean National Assembly(1988-1992, 1996-2004) directly elected by the people of his hometown, Chuncheon city, Gangwon-do Province.
He is currently, among others, Chair of High-Level Experts and Leaders Panel on Water and Disasters (HELP)(2007-), Chair of the Water Advisory Group of Asia Development Bank(2014-), Club de Madrid Member, and Maureen and Mike Mansfield Foundation International Advisory Board Member, Vice-Chair of Zayed Sustainability Prize Jury, Co-Chair of International Finance Forum(China), Distinguished Professor at Zhejiang University International Business School, Chief International Adviser of International Monetary Institute(IMI) of Renmin University of China, Member of the Advisory Board of Shanghai Institutes for International Studies, Special Adviser to SC Cheil Bank and Chair of the Board of Trustees of Yuhan Foundation. He was Chairman of the 2014 PyeongChang Winter Olympics Games Bid Committee.
He was awarded, among many domestic and foreign decorations and prizes, the 6th European Communities Prize in 1971(for his doctoral thesis on the Growth and Function of the European Budget), Nobel Peace Prize on behalf of the United Nations in 2001 and an honorary Knight Commander of the Order of the British Empire (KBE) from HM Queen Elizabeth II of the United Kingdom in 2004.
