8/2005-7/2007 | member | Board of Governors, Prince Philip Dental Hospital |
10/1995-2/2002 | President | Hong Kong College of Otorhinolaryngologists |
2/2002-11/2003 | Immediate-past President | Hong Kong College of Otorhinolaryngologists |
11/2003-11/2005 | Ex-official President | Hong Kong College of Otorhinolaryngologists |
9/1997-present | honorary member | Philippine Academy for Head & Neck Surgery, Philippines |
11/1992-present | member | Hong Kong Institution of Science |
2000-2002 | advisory professorship | Medical Center, Fudan University, Shanghai, Guagnzhou, China |
7/2005- | honorary consultant in otorhinolaryngolgy | Hong Kong Sanatorium & Hospital |
6/2004-present | advisory professor | Ningxia Medical College, Ningxia, China |
12/2004-12/2006 | honorary clinical supervisor | Basic Trainees in Family Medicine, The Hong Kong College of Family Physicians |
4/1999-42008 | external assessor | Department of otorhinolaryngology, Faculty of Medicine, Universiti Malaya, Kuala Lumpur, Malaysia |
2/2000-present | honorary fellow | Philippine Society of Ootlaryngology - Head and Neck Surgery, Philippines |
2/1998-8/2001 | vice president | Hong Kong Institute of Allergy |
8/2001-11/2004 | president | Hong Kong Institute of Allergy |
12/2002-11/2004 | honorary professor | Ear, Throat & Nose, Head and Neck Surgery Hospital, Guangzhou, China |
5/2004-present | honorary fellow | Royal Australasian College of surgeons |
1998-2002 | advisory professor | Sun Yat Sen Medical University, Guangzhou, China |
3/2002-present | advisory professor | Zhengzhou University, Henan, China |
1/2004-1/2007 | member | The Medical of Council of Hong Kong |
10/2002-present | guest professor | Tongji Medical College, Huazhong University of Science & Technology, China |
| national delegate | International Federation of Head and Neck Oncologic Societies |
5/2002-5/2004 | member | Appeals Committee, Hong Kong Academy of medicine |
11/2004-11/2006 | visiting professor | Guiyang Medical College, Guiyang City, Guizhou Province, China |
12/1997-present | honorary director | The First Medical School, West China University of Medical Sciences, Chengdu, Sichuan, China |
2002-2005 | visiting professor | Zhongshan University, Guangzhou, China |
10/2002-present | member | International Federation of Oto-Rhino-Laryngological Societies, Ad Hoc Committee Oncology and Head and Neck Surgery |
| specialist consultant | School of Otolaryngology, Capital University of Medical Sciences, Beijing, China |
4/2001-present | newsletter editor | International Federation of Oto-Rhino-Laryngological Societies |
10/2002-present | executive committee | International Federation of Oto-Rhino-Laryngological Societies |
10/2002-present | audit committee member | International Federation of Oto-Rhino-Laryngological Societies |
2000-2001 & 2004-2005 | President | Hong Kong Head and Neck Society |
2003-2004 | President Elect | Hong Kong Head and Neck Society |