S. R. Nathan

Sellapan Ramanathan, often known as S. R. Nathan, was a Singaporean civil servant, diplomat and politician 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.