The Secretary-General of the United Nations, abbreviated UNSG, is the head of the United Nations Secretariat, one of the principal organs of the United Nations. The Secretary-General also acts as the de facto spokesperson and leader of the United Nations. The current Secretary-General is Ban Ki-moon of South Korea, who took office on 1 January 2007. His first term expired on 31 December 2011. He was re-elected, unopposed, to a second term on 21 June 2011.
