Professor LUI retired in 2008 after serving 41 years in the Ministry of Defence and 22 years as Chief Defence Scientist. He is currently serving as Temasek Defence Professor of National University of Singapore and on the board of twelve research institutes and corporations. He is a member of the Changi Airport Group Executive Committee for Airport Development, member of the MPA Next Generation Port 2030 Steering Committee, member of Committee on Autonomous Road Transport in Singapore and adviser to the Land Transport Authority.
In 2002 Prof Lui received the National Science & Technology Medal “For his outstanding leadership in the build up of science and technology capability for the nation and its exploitation for major systems of national impact”. In 2009 he received the rare Pioneer Award of International Council on Systems Engineering (INCOSE) “for dedicating his life to systems thinking and application, resulting in both an unparalleled impact in Singapore, and advances in the development of systems engineering around the world.” In 2011 he was conferred an Honorary Fellow of the ASEAN Federation of Engineering Organizations and received the Institute of Physics of Singapore President Medal. In 2014 he received the IES the Lifetime Engineering Achievement Award and the Scout distinguished service silver award from President Dr Tony Tan. In 2015 he received the Defence Technology Medal (Outstanding Service) from Ministry of Defence and Aviation Pioneer Award from the Singapore Institute of Aviation Engineers. In 2021 he was appointed the inaugural Temasek Defence Professor by the President of National University of Singapore.