| CAA Conference Committee, HKIA | 9/1999 - Present | Member | | Mr Lu Lu Leslie Lam |
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| CAA International Arbitration Center (CAAI) | 12/2018 - Present | Arbitrator | | |
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| CAADRIA | 09/2020 - Ongoing | Workshop Coordinator | | |
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| CAADRIA (The Association for Computer-Aided Architectural Design Research in Asia) | |
| CAB Day, Chinese Association for Biomaterials, USA | |
| Cadenza: A Jockey Club Initiative for Seniors | |
| CAI Discipline Advisory Panel HKIE | |
| CAI Division - HKIE | 2006-07 | Deputy Chairman | | | 2007- | Division Committee Member | | |
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| CAISE, HKU | 6/2023 - 10/2023 | Acting Director | | Mrs Chan Pun Chan Pun Kit Ling | 9/2015 - 8/2019 | Training Director | | Mrs Chan Pun Chan Pun Kit Ling | 9/2019 - present | Co-director | | Mrs Chan Pun Chan Pun Kit Ling |
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| Calcutta Statistical Association (CSA) | |
| CALICO Journal | July/2011 -- present | editorial board member | | |
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| California Bar Association | 10/2005 - present | Member | | Mr Lefler Lefler Beau Linton |
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| California Board of Psychology | 01/2016-Present | Licensed Psychologist | | Dr Lee Lee Kin Cheung |
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| California PATH | |
| CAMAC, Etat de Vaud, Switzerland | 2007-present | Swiss Registered Architect | | |
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| Cambodia TESOL | 2015 | Founding Steering Committee Eminent Mentor | | Dr Wong Wong Lillian Lai Ching |
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| Cambridge Historical Society (UK) | |
| Cambridge International VATS Symposium | 2015-present | Course Director | | |
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| Cambridge Oversea Trust | 10/2003-12/2016 | Life Fellow | | |
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| Cambridge Philosophical Society | 12/2003-12/2013 | Fellow | | | 01/2014-12/2016 | Life Fellow | | |
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