Professor MA, Estella P. M.

Estella's research has taken a functional perspective and is framed by the health classification scheme of the World Health Organization's International Classification of Functioning, Disability and Health (ICF). The long-term goal is to develop theory-driven voice assessment and treatment protocols to enhance patient's functional voice communication and hence quality of life.

Key research areas: 

• Voice problems in children and older adults
• Application of motor learning theory in vocal skills acquisition
• Functional communication in communication disorders
• Instrumental (acoustic and physiological) voice analysis

https://voice.edu.hku.hk

https://greenvoice.edu.hku.hk

2024 - Faculty Teaching Innovation Award (Team Award, Leader), The University of Hong Kong.

2013 - Faculty Outstanding Teaching Award (Team Award), The University of Hong Kong.

2012 - Faculty of Education Outstanding Teaching Award (Team Award), awarded by the University of Hong Kong.

2012 - The 15th Annual David W. Brewer Award for Best Poster (First Place), awarded by the America Voice Foundation Symposium.

2007 - Faculty of Education Outstanding Researcher Award for Early Career Research Achievements.

External competitive research grants (as Principal Investigator)

2023. Application of virtual reality environments in promoting resonant voice generalization for primary school teachers with voice problems. RGC General Research Fund (2023-26. Principal Investigator. HK$520,300).

2022. Voice therapy for children with benign vocal fold lesions: A comparison of voice outcomes between telepractice and traditional face-to-face model of service delivery. RGC General Research Fund (2022-25. Principal Investigator. HK$796,003).

2016. The effectiveness of vocal hygiene education with resonant voice training for children with voice disorders: A randomized controlled trial. RGC General Research Fund (2016-19. Principal Investigator. HK$855,300).

2012.   Determining the individual, community and societal response to communication impairment in Australia and China. Awarded by the Academy of the Social Sciences in Australia: Australia-China Joint-action Exchange Program (2012. Co-Principal Investigator. AU$6,500)

2010.   Development and validation of a voice assessment protocol for Cantonese children. RGC General Research Fund (2010-13. Principal Investigator. HK$923,153).

2008.   Effects of self-controlled feedback paradigm on motor learning of a "relaxed phonation" task. RGC General Research Fund (previously Competitive Earmarked Research Grant) (2008-10. Principal Investigator. HK$326,862).

Teaching Development grants (as Principal Investigator) 

2024. Application of virtual reality in clinical education of speech-language pathology students. University Teaching Development Grant. (Principal Investigator. HK$280,361).

2022.  Building a sustainable model for integrating simulated patient program into the BSc Speech and Hearing Sciences Curriculum. University Teaching Development Grant. (Principal Investigator. HK$298,159).

2020.   Enhancing the bridging of theory to practice in speech therapy students through the use of simulated patients. University Teaching Development Grant. (Principal Investigator. HK$287,666).

Knowledge Exchange Grants (as Principal Investigator)

2021. Intergeneration Voice Induction Program Buddy (Intergeneration VIP Buddy). HKU Knowledge Exchange Fund for Impact Project. (Principal Investigator. HK$149,615).

2020.   Voice Care cum STEM (VC-STEM): Integrating STEM eduaction into voice care education for primary school students in Hong Kong. HKU Knowledge Exchange Fund for Impact Project. (Principal Investigator. HK$149,516).

2016.   Green Voice for School: Promoting knowledge of healthy voice use in primary school students. HKU Knowledge Exchange Fund for Impact Project. (Principal Investigator. HK$98,641).

Journal Publications (selected)

⁺ PhD. / M.Phil. student author

^# undergraduate honours author

* corresponding author or co-first author

1. Gao, S.-H.⁺, Lu, D., Siu, A. K.-Y., & Ma, E. P.-M.* (in press). Aging voice in Cantonese-speaking older adults: Laryngeal structural status, self-perceived voice issues and voice characteristics. Journal of Voice.
2. Ma, E. P.-M.*, Li, I., Y.-L., Yuen, C. W.-N.⁺, & Cheung, W. M.-Y. (2006, Epub ahead of print). Delievering a voice education program to school-age children through the lens of sciences, technology, engineering and mathematics. Folia Phoniatrica et Logopedica. https://doi.org/10.1159/000551246
3. Ma, E. P.-M.*, Kan, A. W.-S.^#, & Chung, N. T.-C.^# (2026, Epub ahead of print). Practices, perceptions, and attitudes of speech-language pathologists in Hong Kong on using telepractice for pediatric voice therapy: Insights from the post-COVID-19 pandemic era. Journal of Voice. https://doi.org/10.1016/j.jvoice.2026.01.052
4. Ma, E. P.-M.*, Ng, A. O.-M.^#, & Yuen, C. W.-N.⁺ (2026). Immediate effects and one-year maintenance of an educational vocal hygiene program for older adults. International Journal of Language and Communication Disorders, 61(1), e70179. https://doi.org/10.1111/1460-6984.70179
5. Ma, E. P.-M.*, Lee, T.-Y., & Li, W.-H. (2026). Enhancing preclinical speech-language pathology students' self-perceived clinical competence using simulated patients. CoDAS, 38(1), e20250054. https://doi.org/10.1590/2317-1782/e20250054en
6. Lau, N. Y.-K.^#, & Ma, E. P.-M.* (2025, Epub ahead of print). A comparison of the effects of acute whole-body vibration for relieving vocal fatigue in young and older adults. Journal of Voice. https://doi.org/10.1016/j.jvoice.2025.03.038
7. Zeng, Q.-H., Pu, D., Pan, Z.-J., Peng, Y.-Y., Ma, T.-P., Ma, E. P.-M.*, & Lu, D.* (2024, Epub ahead of print). Management of pediatric voice disorders: perceived knowledge, confidence, attitude and practice patters among otolaryngologists in China. Journal of Voice. https://doi.org/10.1016/j.jvoice.2024.09.009
8. Gao, S.-H.⁺, & Ma, E. P.-M.* (2024, Epub ahead of print). The relationship between voice parameters and speech intelligibility: A systematic review. Journal of Voice. https://doi.org/10.1016/j.jvoice.2024.04.013
9. Lee, J. T.^#, Siu, A. K.-Y., & Ma, E. P.-M.* (2025). Intepreting pediatric laryngeal ultrasonography: A training protocol for novice examiners. Journal of Speech, Language and Hearing Research, 68(3), 935-948. https://doi.org/10.1044/2024_JSLHR-24-00367
10. Adriaasen, A., Meerschman, I., van Lierde, K., Claeys, S., Ma, E. P.-M., Kissel, I., Papeleu, T., & D'haeseleer, E.* (2025). Short-term effects of semi-occluded vocal tract therapy on the phonation of children with vocal nodules nodules: A randomized controlled trial. Journal of Speech, Language and Hearing Research, 68(2), 456-477. https://doi.org/10.1044/2024_JSLHR-24-00243
11. Ma, E. P.-M.*, Chow, A. Y.-T.^#, & Lam, V. W.-Y.^# (2025). Management of pediatric voice disorders: Perceived knowledge, confidence, attitude and practice patterns among school-based speech-language pathologists in Hong Kong. Journal of Voice, 39(2), 567.e7-567.e21. https://doi.org/10.1016/j.jvoice.2022.10.010
12. Yuen, C. W.-N.⁺, & Ma, E. P.-M.* (2024). Systematic reviewL Singing-based interventions to improve physical functions related to aging voice in older adults. Journal of Speech, Language and Hearing Research, 67(7), 2139-2158. https://doi.org/10.1044/2024_JSLHR-23-00641
13. Pan, Z., Ma, T., Gao, B., Ma, E. P.-M., Yu, L., Qiu, Z., & Lu, D.* (2024). Survey of referral patterns in southwestern Mainland China: How do pediatricians manage children with dysphonia? Journal of Voice, 38(6), 1532.e1-1532.e9. https://doi.org/10.1016/j.jvoice.2022.04.017
14. Ma, E. P.-M.*, Cheung, Y.-C.^#, Siu, A. K.-Y., & Lo, J. F.-W. (2022). The effectiveness of vocal hygiene education with resonant voice therapy for school-aged children with vocal nodules. Journal of Voice, 38(2), 538.e23-538.e30. https://doi.org/10.1016/j.jvoice.2021.08.015
15. Rocha, B. R., Wong, A. W.-K., Ma, E. P.-M., & Behlau, M.* (2022). Equivalência cultural da versão brasileira do protocolo Speech-Specific Reinvestment Scale - SSRS. (Cross-cultural adaptation of the Brazilian version of the Speech-Specific Reinvestiment Scale - SSRS). CoDAS, 34(4), e20200385. https://doi.org/10.1590/2317-1782/20212020385
16. Ma, E. P.-M.*, Tse, M. M.-S.^#, Mommien, M., Pu, D., & Chen, F. F. (2021). The effects of dysphonic voices on speech intelligibility in Cantonese-speaking adults. Journal of Speech, Language and Hearing Research, 64(1), 16-29. https://doi.org/10.1044/2020_JSLHR-19-00190
17. Wong, H. Y.-K.^# & Ma, E. P.-M.* (2021). Self-perceived voice problems in a non-treatment seeking older population in Hong Kong. Journal of Voice, 35(4), 597-603. https://doi.org/10.1016/j.jvoice.2019.12.012
18. Ma, E. P.-M.*, & Leung, H. K.-H.^# (2021). One-year follow-up of a vocal hygiene program for school-age children. Folia Phoniatrica et Logopedica, 73(1), 1-6. https://doi.org/10.1159/000503449
19. Lo, E. S.-C., Wong, A. W.-K., Tse, A. C.-Y., Ma, E. P.-M., Whitehill, T. L., & Masters, R. (2020). Development of a psychometric measure to assess the propensity for conscious speech motor control. Journal of Speech, Language, and Hearing Research, 63(4), 963-982. https://doi.org/10.1044/2020_JSLHR-19-00365
20. Ma, E. P.-M.*, & Wu, M. C.-K.^# (2019). Age estimation from voice in the Cantonese-speaking elderly population: Influence of listener's age and stimulus types. Speech, Language and Hearing, 1-7. https://doi.org/10.1080/2050571X.2019.1634348
21. Lo, E. S.-C., Wong, A. W.-K., Tse, A. C.-Y., Ma, E. P.-M., Whitehill, T., & Masters, R. (2019). Effects of error experience on learning to lower speech nasalance level. American Journal of Speech-Language Pathology, 28(2), 448-455. https://doi.org/10.1044/2018_AJSLP-18-0033
22. Lu, D., Yiu, E. M.-L., Pu, D., Yang, H., & Ma, E. P.-M. (2019). Parental knowledge, attitudes and practices about vocal hygiene for their children in Chengdu, a city from China. Medicine, 98(16), e15252. https://doi.org/10.1097/MD.0000000000015252
23. Lang, B. H.-H., Wong, C. K.-H., Ma, E. P.-M., Woo, Y. C., & Chiu, K. W.-H. (2019). A propensity-matched analysis of clinical outcomes between open thyroid lobectomy and high-intensity focused ultrasound (HIFU) ablation of benign thyroid nodules. Surgery, 165, 85-91. https://doi.org/10.1016/j.surg.2018.05.080
24. Chui, J. C.-H.^#, & Ma, E. P.-M.* (2019). The impact of dysphonic voices on children's comprehension of spoken language. Journal of Voice, 33(5), 801.e7-801.e16. https://doi.org/10.1016/j.jvoice.2018.03.004
25. Lu, D., Ma, E. P.-M., Ren, J., Pu, D., Hui, Y., & Yiu, E. M.-L. (2019). Mandarin (Simplified) Chinese version of the Vocie Activity and Participation Profile: Adaptattion and validation. Journal of Voice, 33(1), 103-109. https://doi.org/10.1016/j.jvoice.2017.09.015
26. Ma, E. P.-M. (2018). The use of the ICF in clinical research, practice and education: A Hong Kong perspective. Perspectives of the ASHA Special Interest Group 17 Global Issues in Communication Sciences and Related Disorders, 3(17), 86-92. [invited] https://doi.org/10.1044/persp3.SIG17.86
27. Lu, D., Huang, M., Li, Z., Yiu, E. M.-L., Cheng, I. K.-Y., Yang, H., & Ma, E. P.-M. (2018). Adaptation and validation of Chinese version of the pediatric Voice Handicap Index (pVHI). International Journal of Pediatric Otorhinolaryngology, 104, 19-24. https://doi.org/10.1016/j.ijporl.2017.10.034
28. Lang, B. H.-H., Wong, C. K.-H., Ma, E. P.-M. (2017). Single-session high intensity focused ablation (HIFU) versus open cervical hemithyroidectomy for benign thyroid nodule: analysis on early efficacy, safety and voice quality. International Journal of Hyperthermia, 1-7. https://doi.org/10.1080/02656736.2017.1305127
29. Ma, E. P.-M., & Li, T. K.-Y.^# (2016). Effects of coaching and repeated trials on maximum phonational frequency range in children. Journal of Voice, 31(2), 243-e1. https://doi.org/10.1016/j.jvoice.2016.05.013
30. Tse, A. C.-Y.⁺, Wong, A. W.-K., Whitehill, T.L., Ma, E. P.-M., & Masters, R. (2016). Examining the cognitive demands of analogy instructions compared to explicit instructions. International Journal of Speech-Language Pathology, 18(5), 465-472. https://doi.org/10.3109/17549507.2015.1112834
31. Ma, E. P.-M., & Lam, N. L.-N.^# (2015). Speech task effects on acoustic measure of fundamental frequency in Cantonese-speaking children. International Journal of Pediatric Otolaryngology, 79(12), 2260-2264. https://doi.org/10.1016/j.ijporl.2015.10.018
32. Lang, B. H.-H., Wong, C. K.-H., & Ma, E. P.-M. (2015). A systematic review and meta-analysis on acoustic voice parameters after uncomplicated thyroidectomy. The Laryngoscope. https://doi.org/10.1002/lary.25452
33. Yiu, E.M.-L., Chan, K.M.-K., Kwong, E., Li, N, Y-K., Ma, E. P.-M., Tse, F. W., Lin, Z. X., Verdolini-Abbott, K., & Tsang, R. (2015). Is acupuncture efficacious for treating phonotraumatic vocal pathologies? A randomized control trial. Journal of Voice. https://doi.org/10.1016/j.jvoice.2015.07.004
34. Yiu, E.M.-L., Chan, K.M.-K., Li, N, Y-K., Tsang, R., Verdolini-Abbott, K., Kwong, E., Ma, E. P.-M., Tse, F. W., & Lin, Z. X. (2015). Wound-healing effect of acupuncture for treating phonotraumatic vocal pathologies: A cytokine study. The Laryngoscope, 126(1), E18-E22. https://doi.org/10.1002/lary.25483
35. Chan, K. M.-K., Li, C.M., Ma, E. P.-M., Yiu, E. M.-L., & McPherson, B. (2015). Noise levels in urban Asian school environments. Noise and Health, 17(74), 48-55. https://doi.org/10.4103/1463-1741.149580
36. Chen, F. C.⁺, Ma, E. P.-M., & Yiu, E. M.-L. (2014). Facial bone vibration in resonant voice production following resonant voice training. Journal of Voice, 28, 596-602. https://doi.org/10.1016/j.jvoice.2013.12.014
37. Yiu, E. M.-L., Wang, Gaowu, Lo, A. C.-Y., Chan, K. M.-K., Ma, E. P.-M., Kong, JP., & Barrett, E. (2013). Quantitative high-speed laryngoscopic analysis of vocal fold vibration in fatigued voice of young Karaoke singers. Journal of Voice, 27, 753-761. https://doi.org/10.1016/j.jvoice.2013.06.010
38. Yiu, E. M.-L., Lau, V. C.-Y., Ma, E. P.-M., & Chan, K. M.-K. (2013). Reliability of Laryngo-stroboscopic evaluation on lesion size and glottal configuration: A revisit. The Laryngoscope, 124(7), 1638-1644. https://doi.org/10.1002/lary.24521
39. Ma, E. P.-M., & Yu, C. H.-Y.^# (2013). Listeners' attitudes toward children with voice problems. Journal of Speech, Language and Hearing Research, 56, 1409-1415. https://doi.org/10.1044/1092-4388(2013/11-0242)
40. Tse, A. C.-Y.⁺, Wong, A. W.-K., Ma, E. P.-M., Whitehill, T. L., & Masters, R. S. W. (2013). Influence of analogy instruction for pitch variation on perceptual ratings of other speech parameters. Journal of Speech, Language and Hearing Research, 56, 906-912. https://doi.org/10.1044/1092-4388(2012/12-0051)
41. Wong, A. W.-K., Whitehill, T. L., Ma, E. P.-M., & Masters, R. (2013). Effects of practice schedules on speech motor learning. International Journal of Speech-Language Pathology, 15, 511-523. https://doi.org/10.3109/17549507.2012.761282
42. Ma, E. P.-M., Baken, R. J., Roark, R. M., & Li, P.-M.^# (2012). Effect of tones on vocal attack time (VAT) in Cantonese speakers. Journal of Voice, 26(5), 670e1-670e6. https://doi.org/10.1016/j.jvoice.2011.07.015
43. Wong, A. W.-K., Whitehill, T., Ma, E. P.-M., & Masters, R. (2012). Effects of errorless learning on the acquisition of velopharyngeal movement control [abstract]. Journal of Acoustical Society of America, 131(4-2), 3273. https://doi.org/10.1121/1.4708235
44. Tse, A. C.-Y.⁺, Masters, R. S. W., Whitehill, T. L., & Ma, E. P.-M. (2012). The use of analogy in speech motor learning. International Journal of Speech-Language Pathology, 14(1), 84-90. https://doi.org/10.3109/17549507.2011.616600
45. Wong, A. Y.-H.⁺, Ma, E. P.-M.*, & Yiu, E. M.-L. (2011). Effects of practice variability on learning of relaxed phonation in vocally hyperfunctional speakers. Journal of Voice, 25(3), e103-e113. https://doi.org/10.1016/j.jvoice.2009.10.001
46. Yiu, E. M.-L., Ho, E. M., Ma, E. P.-M., Verdolini-Abbott, K., Branski, R., Richardson, K., & Li, N. (2011). Possible cross-cultural differences in the perception of impact of voice disorders. Journal of Voice, 25(3), 348-353. https://doi.org/10.1016/j.jvoice.2009.10.005
47. Ma, E. P.-M. & Love, A.^# (2010). Electroglottographic evaluation of age and gender effects during sustained phonation and connected speech. Journal of Voice, 24(2), 146-152. https://doi.org/10.1016/j.jvoice.2008.08.004
48. Whitehill, L. T., Ma, E. P.-M., & Tse, F. C.-M.^# (2010). Environmental barriers to communication for individuals with dysarthria. Journal of Medical Speech-Language Pathology, 18(4), 141-144.
49. Law, I. K.-Y., Ma, E. P.-M., & Yiu, E. M.-L. (2009). Speech intelligibility, acceptability and communication-related quality of life among alaryngeal speakers. Archives of Otolaryngology-Head and Neck Surgery, 135(7), 704-711. doi:10.1001/archoto.2009.71
50. Ma, E. P.-M., Threats, T. T., & Worrall, L. E. (2008). An introduction to the International Classification of Functioning, Disability and Health (ICF) for speech-language pathology: Its past, present and future. International Journal of Speech-Language Pathology, 10(1-2), 2-8. https://doi.org/10.1080/14417040701772612

Scholarly books and edited volumes 

1. Ma, E. P.-M. (2023). Voice Therapy for Children: An Instructional Manual. Hong Kong University Press. (ISBN: 978-988-8754-21-2; 108 pages)
2. Ma, E. P.-M. & Yiu, E. M.-L. (Eds.) (2011). Handbook of Voice Assessments. San Diego, California: Plural Publishing Inc. (ISBN: 978-1-59756-364-2; 362 pages)
3. Worrall, L. E., Ma, E. P.-M. & Threats, T. T. (Guest editors) (2008). Contribution of the ICF to speech-language pathology. Special issue of International Journal of Speech-Language Pathology, 10(1-2).

Book chapters

1. Ma, E. P.-M., & Lee T. K.-Y.⁺ (2013). Section A - Current Issues in Voice Assessment and Intervention: A World Perspective – Hong Kong. In E. Yiu (Ed.), International Perspectives on Voice Disorders. Multilingual Matter. [Invited]
2. Ma, E. P.-M., & Yiu, E. M.-L. (2013). Contemporary voice research: A World Perspective – Motor Learning and voice disorders. In E. M.-L. Yiu (Ed.), International Perspectives on Voice Disorders. Multilingual Matter.
3. Ma, E. (2013). Functional assessment of voice disorders: A theoretical framework. In E. Yiu (Ed.), Manual of Clinical Voice Assessment and Therapy: A Hong Kong Perspective. (2nd Ed.) Hong Kong: Centre for Communication Disorders, The University of Hong Kong.
4. Ma, E., & Yiu, E. (2013). Voice Activity and Participation Profile. In E. Yiu (Ed.), Manual of Clinical Voice Assessment and Therapy: A Hong Kong Perspective. (2nd Ed.) Hong Kong: Centre for Communication Disorders, The University of Hong Kong.
5. Yiu, E., & Ma, E. (2013). Voice therapy instructional manual. In E. Yiu (Ed.), In E. Yiu (Ed.), Manual of Clinical Voice Assessment and Therapy: A Hong Kong Perspective. (2nd Ed.) Hong Kong: Centre for Communication Disorders, The University of Hong Kong.
6. Ma, E. (2013). Chewing technique: Speak with an "Open Mouth". In A. Behrman. & J. Haskell (Eds.). Exercises for voice therapy (2nd Ed.). San Diego, California: Plural Publishing Inc. [Invited]
7. Ma, E. P.-M., & Yiu, E. M.-L. (2012). Voice research in Hong Kong: Its past, present and future. In Goldfarb, R. (Ed.). Translational SLP/A: Essays in honor of Dr. Sadanand Singh. San Diego, California: Plural Publishing Inc. [Invited]
8. Ma, E. P.-M., & Yiu, E. M.-L. (2011). Introduction. In E. P.-M. Ma & E. M.-L. Yiu (Eds.). Handbook of Voice Assessments. San Diego, California: Plural Publishing Inc.
9. Ma, E. P.-M. (2011). Voice Range Profile: Phog. In E. P.-M. Ma & E. M.-L. Yiu (Eds.). Handbook of Voice Assessments. San Diego, California: Plural Publishing Inc.
10. Ma, E. P.-M. (2011). Monitoring oral air and air pressure during speech production: Aerophone. In E. P.-M. Ma & E. M.-L. Yiu (Eds.). Handbook of Voice Assessments. San Diego, California: Plural Publishing Inc.
11. *Wong, A. Y.-H., & Ma, E. P.-M. (2011). Assessing vocal hyperfunction using surface electromyography. In E. P.-M. Ma & E. M.-L. Yiu (Eds.). Handbook of Voice Assessments. San Diego, California: Plural Publishing Inc.
12. Ma, E. (2008). Chewing technique: Speak with an "Open Mouth". In A. Behrman. & J. Haskell (Eds.). Exercises for voice therapy (pp. 85-86). San Diego, California: Plural Publishing Inc. [Invited]

Editorships & reviewers for scientific journals and conference proceedings

Editorial Board Member, Advances in Communication and Swallowing. 2025 to present.

Associate Editor (Vocology), Logopedics Phoniatrics Vocology. 2022 to present. 

Editorial Board Member, Journal of Speech, Language and Hearing Research. 2022-24.

Associate Editor (Voice) and Editorial Board Member, Language Speech and Hearing Services in Schools. 2016 to 2018.

Associate Editor (Voice), Folia Phoniatrica et Logopedica. 2013 to 2016.

Editorial Board member, Logopedics Phoniatrics Vocology. Dec 2012 to 2021.

Chief Editor (guest) of a special issue, Seminars in Speech and Hearing. 2007.

Co-Editor (guest) of a special issue, International Journal of Speech-Language Pathology, 2008.

Editorial Consultant (overseas), Journal of the Speech-Language-Hearing Association of Taiwan. 2009 to 2011.

Ad hoc reviewer, Hong Kong RGC General Research Fund. 2011.

Ad hoc reviewer in journals:

Speech Pathology Australia Conference Proceedings. 2001 to 2004;

Advances in Speech-Language Pathology. 2006 to 2009;

Journal of Psychosometric Research. 2008, 2010, 2011;

Asia Pacific Journal of Speech, Language and Hearing. 2000 to present;

Journal of Speech, Language & Hearing Research (Speech). 2003 to present;

Acquiring Knowledge in Speech, Language and Hearing. 2005 to present;

Clinical Linguistics & Phonetics. 2007 to present;

International Journal of Speech-Language Pathology). 2010 to present;

Language, Hearing Services in Schools. 2011 to present; Disabilities and Rehabilitation. 2012 to present;

Logopedics, Phoniatrics, Vocology. 2012 to present;

Reviewer (Voice), Folia Phoniatrica et Logopedica. 2003 to present.

Reviewer, Conference proceeding of The 26th International Association of Logopedics and Phoniatrics. 2003.

Reviewer, Conference proceeding of The 5th Asia Pacific Conference on Speech, Language and Hearing. 2007.

Committees for professional bodies

Executive committee, The Hong Kong Association of Speech Therapists. Sept 1999-2001.

Executive committee, Sir Edward Youde Scholars Association (SEYSA). Sept 2000-2003.

Steering member (Hong Kong representative), Asia Pacific Society for Speech, Language & Hearing. 2001 to 2011.

Council member of interim council, The Hong Kong Voice Foundation. 2006 to present.

Committee member, IALP Voice Committee. (Hong Kong representative). 2008 to present.

Committees for conferences and synergistic events

Program Committee, The 26th International Association of Logopedics and Phoniatrics. 2003.

Organizing committee (Hong Kong representative), World Voice Day. 2006, 2007, 2013 & 2014.

Organizing committee, Hospital Authority Symposium. 2009.

Coordinator, The Inaugural Hong Kong Speech and Hearing Symposium. 2010.

Organizing Committee, Summerfest 2011 on "Challenges to Healthy Communication" cum Annual Presentation of B.Sc. (Speech & Hearing Sciences) fourth year dissertations.

Organizing Committee, Summerfest 2012 on "Making Communication Science Works" cum Annual Presentation of B.Sc. (Speech & Hearing Sciences) fourth year dissertations.

Organizing Committee (Hong Kong Institute of Acoustics HKIOA representative for technical program on "Speech Communications"), The Acoustics 2012 Hong Kong. 2011 to 12. [The Acoustics 2012 is jointly organized by the HKIOA, Hong Kong the Acoustical Society of America (ASA), the Acoustical Society of China (ASC) and the Western Pacific Acoustics Conference (WESPAC)] [Invited]