S. R. Nathan, 6th President of Singapore (born 1924)

Sellapan Ramanathan, often known as S. R. Nathan, was a Singaporean statesman who served as the sixth president of Singapore between 1999 and 2011. He was the longest-serving president in the country's history, holding office for two full terms. Prior to his presidency, Nathan held various key positions in the public service, including roles in the Ministry of Foreign Affairs, the Ministry of Home Affairs and the Security and Intelligence Division (SID). He also served as Singapore's High Commissioner to Malaysia and Ambassador to the United States.

The president of the Republic of Singapore is the head of state of Singapore. The president represents the country in official diplomatic functions and possesses certain executive powers over the government of Singapore, including the control of the national reserves and the ability to revoke and appoint public service appointments.