Mr Hui has been Secretary for Financial Services and the Treasury since 2020. He serves on the boards of Mass Transit Railway Corporation Limited, Hong Kong Airport Authority, Hong Kong Investment Corporation Limited, and also as the Chairman of the Kowloon-Canton Railway Corporation. He was an Administrative Officer in the Government from 1999 to 2003. After leaving the Government, Mr Hui spent 13 years at the Hong Kong Exchanges and Clearing Limited, having been the Managing Director for Market Development and Head of Project Management and also in various senior roles in Listing and Market Development. He worked for a number of multi-national companies in the private sector. He was appointed the Executive Director of the Hong Kong Financial Services Development Council from 2019 to 2020. Mr Hui holds Bachelor and Master (Hon) Degrees in Philosophy, Politics and Economics from the University of Oxford, and Master of Business Administration Degree from INSEAD. He also attended the Stanford Executive Programme (SEP).