Prior to this appointment, he was Permanent Secretary in the Ministry of the Environment and Water Resources from July 2012 to September 2017.Mr Choi started his career in the Singapore Armed Forces (SAF) in 1978. He held various appointments in the SAF before he was appointed as Director, Security and Intelligence Division, Ministry of Defence in 1995 and held the post till 2005. After leaving the Ministry of Defence, Mr Choi held the post of Permanent Secretary in the Ministry of Transport from February 2005 to June 2012.
Mr Choi studied at the University of Cambridge, graduating with Bachelor’s and Master’s degrees in Engineering in 1981 and 1985 respectively. He also obtained a Master’s degree in Public Administration from Harvard University in 1994.
Mr Choi was awarded the Public Administration Medal (Silver) (Military) in 1993 and the Meritorious Service Medal in 2000 for his significant contributions to the Singapore Public Service.