You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Who is the current Secretary General of the UN? and explain in detail?
Ban Ki-moon is the eighth Secretary-General of the United Nations. Mr Ban took office on 1 January 2007. On 21 June 2011, he was unanimously re-elected by the General Assembly and will continue to serve until 31 December 2016. Ref: http://www.un.org/sg/biography.shtml.