S. R. Nathan was first sworn in as the sixth president of Singapore on 1 September 1999. In 1999 and 2005, he was elected President in an uncontested elections. In 2009, he surpassed Benjamin Sheares to become Singapore’s longest-serving President. His 12-year term ended on 31 August 2011. Since then, he has been the nation’s only living former President.


Source: http://en.wikipedia.org/wiki/S._R._Nathan