Prior to his joining Chip Eng Seng Corporation Ltd (“CES”) in February 2018, Mr Tan had served 34 years in the Singapore Administrative Service, holding various key appointments, including Principal Private Secretary to the then-Prime Minister, Mr Goh Chok Tong (from 1997 to 2000) and founding CEO of National Healthcare Group (from 2000 to 2004). He was the Permanent Secretary of the Ministry of National Development (from 2004 to 2011) and of the Ministry of Home Affairs (from 2011 to 2014). From 2014 to 2018, he was the Commissioner of Inland Revenue of Singapore (“IRAS”) and concurrently the Chief Executive Officer (“CEO”) of IRAS. He retired from public service in 2018.