 Woon was called to the Singapore Bar in 1985 . The first edition of his book Company Law was published in 1988 . The same year he became a Sub @-@ Dean of the NUS Faculty of Law , then served as Vice @-@ Dean from 1991 to 1995 . On 1 February 1999 Woon was appointed a professor of law . In November 1990 , Woon appeared before the Parliamentary Select Committee on the Constitution of the Republic of Singapore ( Amendment No. 3 ) Bill ( Bill No. 23 / 90 ) to make representations on the proposed introduction of an elected President for Singapore . He took the view that since the elected President should be politically neutral , Cabinet members should only be eligible to stand for election five years after leaving politics . 
