| 1962 | Joined Hai Sun Hup & Co. |
| 1966 | Managing Director, Hai Sun Hup Co. (Private) Limited (renamed Stamford Land Corporation Limited) |
| 1971-73 | Member, Free Trade Zone Advisory Committee (MOF) |
| 1977-07 | Chairman, Mitsui O.S.K Lines (Singapore) Private Limited |
| 1977-07 | Singapore Representative, The Economic Development Corporation of the Federal State of Bremen (EDCB). |
| 2000 | Gran Oficial, Order of Bernardo O'Higgins by the President of Chile |
| 2000-present | Chairman, Singapore Shipping Corporation Limited |
| 2001-07 | Honorary Consul-General, Slovak Republic to Singapore |
| 2001-present | Chairman, Stamford Land Corporation Limited |
| 2007-15 | Singapore's Ambassador to Argentina |
| 2009 | Businessman of the Year, Singapore Business Awards (Singapore Press Holdings) |
| 2009-11 | Committee Member, National Arts Council |
| 2011 | Honorary Officer, Order of Australia by the Prime Minister of Australia |
| 2015-present | Singapore's Ambassador to Italy |
