Mr Lee Fook Sun is a Deputy Chairman of SMRT Trains Ltd., SMRT Corporation Ltd and SMRT TEL Pte. Ltd.. 

Mr Lee is concurrently the Chairman of Ensign Infosecurity Pte. Ltd. and Ensign Infosecurity (Cybersecurity) Pte. Ltd.. He also sits on the board of Great Eastern Holdings Limited. 

In December 2014, Mr Lee was appointed Deputy CEO of Singapore Technologies Engineering Ltd., a role he held concurrently with President of Defence Business for the ST Engineering Group and President of Singapore Technologies Electronics Limited.  He has been with ST Engineering Group for 17 years until he retired in June 2017.

Mr Lee started his career with the Singapore Armed Forces (SAF) and he served in the Ministry of Defence (MINDEF) as Director of Joint Intelligence Directorate from 1996 to 2000.  He held various key appointments in MINDEF and the SAF, including Director of Military Security Department and Assistant Chief of General Staff (Logistics).  During his service, Mr Lee was awarded the Public Administration Medal (Military) for the Gold and Silver categories.  He held the rank of Brigadier-General when he retired from active military service.

Mr Lee holds a Bachelor of Arts (Hons) and a Master of Arts in Engineering Science from the University of Oxford and attended the Stanford University Executive Programme.  He was conferred the Honorary Fellowship by the ASEAN Federation of Engineering Organisations (AFEO) in recognition of his contributions to the engineering profession and industry.