Goh Chok Tong (born 20 May 1941; Chinese: 吴作栋; pinyin: Wú Zuò dòng, Wade–Giles: Wu2-tso4-tung4) is a Singaporean politician. A member of the People's Action Party (PAP), he became Singapore's second Prime Minister on 28 November 1990, succeeding Lee Kuan Yew, and served in the role until 12 August 2004, when he stepped down and was succeeded by Lee Hsien Loong. He subsequently served as Senior Minister until May 2011, and as Chairman of the Monetary Authority Of Singapore (MAS).