| R&D Centre for Logistics and Supply Chain Management Enabling Technologies, ITF | 01/2006- | Member of Technology Advisory Group (TAG) | | |
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| R&D Excellence Awards, Kentucky Science and Engineering Foundation (KSEF), Lexington KY, United States. | |
| RACDS | 2012/2013 | Invigilators | | | 03/2011-present | Fellow and Member | | |
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| Radboud University, Radboud Center of Social Science, The Netherlands | 01/2019 - present | Honourary Professor | | |
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| Radiation Board Hong Kong | 2008- | Irradiating apparatus user | | |
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| Radiation Board Licensing Committee | 04/2023-current | Committee member | | |
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| Radiation Research Society (RRS) | |
| Radio Television Hong Kong | 01/2018-07/2020 | Juror, Hong Kong Book Prize | | |
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| Radiol Soc of North Am (RSNA) | 05/1999-present | Member | | Dr Tan Tan Xiaolin |
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| Radiological Protection Advisory Group | |
| Radiological Protection Advisory Group (RPAG) | |
| Radiological Protection Advisory Group, HK government | 06/2016-current | Committee member | | |
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| Radiological Society of North America | 01/2003- 12/2016 | Member | | | 02/2015-now | Member | | |
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| Radiology Society of North America (RNSA) | |
| RAIC | since 09/1985 | Member | | Professor Hui Hui Cheuk Kuen Desmond | 1989-present | Full Member | | |
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| Raising Awareness of Developmental Language Disorder | 2/2019 - present | member of the International Committee | | |
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| RANZCP Section of History Philosophy & Ethics of Psychiatry | |
| Rare Disease Hong Kong | 01/2022-present | Scientific and Medical Advisory Committee | | |
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| Rare Disease International | 01/2022-present | Scientific Advisor | | |
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| RCoA | |
