| Pacific Association of Pediatric Surgeons | | Member | | | 12/06 - now | Board Member & Publication Committee member | | |
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| Pacific Economic Review | 08/2007-11/2007 | Referee | | | 12/2007-03/2008 | Referee | | |
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| Pacific Economiv Review | 2014 - present | Editorial Board member | | |
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| Pacific Forum | 07/2019-present | Adjunct Fellow | | Mr Lee Lee David Seungwoo |
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| Pacific Institutes of Marine Science | 01/2003 - 01/2006 | Member Fellowship Awards Committee | | | 01/2006 - to date | Secretary/Treasurer | | |
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| Pacific Rim Council for Urban Development | |
| Pacific Rim Real Estate Society | |
| Pacific-Asia Conference on Knowledge Discovery and Data Mining | 04/2004 - | Steering Committee Chairman | | |
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| PACIS Exectuive Committee | 06/2013 - 06/2014 | Chairman | | |
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| PACIS Executive Committee | 07/2005 - 06/2007 | Secretary | | |
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| Paediatric Immunology Committee/Chinese Medical Association. | 05/2007-05/2011 | Council member | | |
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| Paediatric Infectious Disease Committee, Chinese Medical Association | 05/2010-present | Council member | | |
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| Paediatric Infectious Disease Committee/Chinese Medical Association. | 06/2007-06/2011 | Council member | | |
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| Paediatric Neurology Association in Hong Kong | 11/2012 -- now | Council member (co-opted) | | |
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| Paediatric Neurology Association of Hong Kong | 2009-now | Founding President | | |
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| Paediatric Neurology Subspecialty Board, Hong Kong College of Paediatricians | 08/2019 -- now | Subspecialty Board Members | | | 08/2019 -- now | Subspecialty Board Members | | |
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| Paediatric Orthopaedic Chapter of Hong Kong Orthopaedic Association | |
| Paediatric Radiology Interest Group, Hong Kong | |
| PAGES Q-MARE – Disentangling climate and pre-industrial human impacts on marine ecosystems | |
| Pain Association of Singapore | 2004-present | member | | Dr Lam Lam Marcus |
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