sentences:  From 1992 until 2004 Dr. Francis M. Deng of the Sudan served as the United Nations' first Special Rapporteur on the Human Rights of Internally Displaced Persons.On 29 May 2007, United Nations Secretary-General Ban Ki-moon announced the appointment of Deng as the new Special Adviser for the Prevention of Genocide, a position he held until 17 July 2012 at the level of Under-Secretary General.From 2006 to 2007, Deng served as director of the Sudan Peace Support Project based at the United States Institute of Peace.