Prior to his political career, he was active in the judiciary, first serving as a Justice's Law Clerk to then Chief Justice Yong Pung How, then as Deputy Public Prosecutor, followed by State Counsel, Magistrate, and finally Assistant Registrar at the High Court of Singapore.
That same year, Yong was appointed Vice-Chairman of the Oversea-Chinese Banking Corporation.
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He also had commercial powers invested upon him as Chairman of the now-defunct Malaysia-Singapore Airlines between 1964 and 1969, and as Deputy Chairman, Malayan Banking Berhad (Maybank) between 1966 and 1971.
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He was seconded in 1982 by the Singapore Government to form and head the Government of Singapore Investment Corporation (GIC), and the Monetary Authority of Singapore as well.
Jin Yong | Wu Yong | Johnny Yong Bosch | Ri Yong-ho | Francis Hong Yong-ho | Yong Nyuk Lin | Kim Yong | Kim Yi-Yong | Jian Yong | Choe Yong-rim | Buyeo Pung | Bae Yong-joon | Yuan Yong | Yong Teck Lee | Yong Pung How | Yong'anli Station | Park Yong-woo | Pak Hon-yong | Lee Yong-shin | Kwak Jae-yong | Kim Yong-Hee | Kim Yong-chun | Kim Taek-Yong | Kim Seung-Yong | Kang Yong-suk | Jong Yong-Ok | Hwang Sok-yong | Huang Yong Ping | Deaf Sam-yong (1964) | Deaf Sam-yong |