Mahmoud Abbas (Arabic: مَحْمُود عَبَّاس‎, Maḥmūd ʿAbbās; born 26 March 1935), also known by the kunya Abu Mazen (Arabic: أَبُو مَازِن‎, 'Abū Māzin), is the President of the State of Palestine and Palestinian National Authority. He has been the Chairman of the Palestine Liberation Organization (PLO) since 11 November 2004 and has been Palestinian president since 15 January 2005 (Palestinian National Authority since 15 January 2005 and State of Palestine since 8 May 2005).