Leong is the Professor of Practice (Design Practice) in the School of Design (SD) at the Hong Kong Polytechnic University. Before rejoining SD, he once served the School as the Leaders of the Asian Lifestyle Design Lab (ALDL), the MDes International Design & Business Management (ID&BM) and BA(hons) Product Design programmes.  Leong has over 25 years of design research and practices. He practiced industrial design in Asia and Europe after his graduation from The PolyU Design and the Royal College of Art in the 80s and 90s respectively. His distinguished designs within the ‘Philips‐Alessi', ‘Vision of the Future’ and ‘Things East‐West’ projects, had won him numerous awards, publications and his ‘Philips‐Alessi' coffee maker is being collected in three design museums in the States and Europe today.

Leong also served or has been serving actively (as Associate Chair, Advisor or Advisory Committee Member) of some key local and national design or design educational entities, such as the Industrial Designers Society of Hong Kong (IDSHK), Federation of Hong Kong Industries (FHKI), Hong Kong Federation of Design Associations (HKFDA), Korean Future Design Research Institute (KFDRI), the ‘Service Design Talent Training Program of China' - Dragon Design Foundation, the Industrial Design Educational Steering Committee of Ministry of Education of the PRC, etc.