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Prof Ling is the Fellow of the Hong Kong Institute of Planners (HKIP). He was the President of HKIP (2007-09), Director of Planning (2012-16) and Strategic Planning Advisor for Hong Kong/Shenzhen Cooperation (June 2021-February 2022) of the HKSAR Government, assisted the Chief Executive in the preparation of the Northern Metropolis Development Strategy.

He is the Professor of Practice (Planning) and Director of Jockey Club Design Institute for Social Innovation of The Hong Kong Polytechnic University, Adjunct Professor of The University of Hong Kong and The Chinese University of Hong Kong, and Associate Fellow of the University College of Estate Management, UK.

He also serves the community as the Vice Chairman of the Hong Kong Housing Society, Director of the Hong Kong Cyberport Management Ltd. and Chairman of its Entrepreneurship Committee, and the Chairman of the Country and Marine Parks Board.