Dr Tan Kim Siew is the Chairman and an Independent Non-Executive Director of VICOM Ltd. He is the Chairman of Nominating and Remuneration Committee and a member of both the Technology Committee and the Sustainability Committee. He is also an Independent Non-Executive Director of SBS Transit Ltd.

Dr Tan is presently a Senior Consultant in the Ministry of Finance. From 2012 to 2014, Dr Tan served as the Commissioner of Inland Revenue. Prior to this appointment, Dr Tan was the Permanent Secretary (Defence Development) of the Ministry of Defence from 2003 to 2012. He had also held other appointments in the public service, including Chief Executive Officer of the Urban Redevelopment Authority, Deputy Secretary in the Ministry of Finance and in the Ministry of National Development, Chairman of the Defence Science and Technology Agency, and Chairman of the DSO National Laboratories.

Dr Tan was awarded the Public Administration Medal (Silver) (Military) in 1990, the Public Administration Medal (Silver) in 1996, the Public Administration Medal (Gold) in 2001 and the Long Service Medal in 2003 by the President of the Republic of Singapore.

Dr Tan holds a Bachelor of Arts (Honours) (Engineering Tripos) with Distinction in Electronics Engineering and Doctor of Philosophy (Engineering) from the University of Cambridge, United Kingdom.