Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Secretary-General of the United Nations, acronym UNSYG, is the head of the 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 will expire on 31 December 2011, and he will be eligible for reappointment. The Secretary-General was envisioned by US President Franklin D. Roosevelt as a "world moderator," but the office was defined in the UN Charter as the organization''s "chief administrative officer" (Article 97). Nevertheless, this more restricted description has not prevented the office holders from speaking out and playing important roles on global issues, to various degrees.