International Committee

RADLD is coordinated by a volunteer committee of professionals from Australia, Canada, China, UK & USA who give up their time to raise awareness of Developmental Language Disorder (DLD). The International Committee meets monthly and is supported by a casual administrative assistant. To get in touch with the RADLD international committee please email

  • Lisa Archibald
    Lisa Archibald

    Associate Professor | School of Communication Sciences & Disorders and Department of Psychology, The University of Western Ontario | CANADA

    Lisa Archibald is an Associate Professor in the School of Communication Sciences and Disorders at The University of Western Ontario. One focus of her research is on links between language and working memory. She also employs a practice-based research approach to partner with school-based speech-language pathologists in exploring services for children with DLD. Access her publications here.

    1. The DLD Diagnostics Toolbox
    2. Developmental Language Disorder: The Childhood Condition We Need to Start Talking About
    3. SLP-educator classroom collaboration: A review to inform reason-based practice


  • Karla McGregor
    Karla McGregor

    Director | Center for Childhood Deafness, Language & Learning - Boystown National Research Hospital & Professor Emerita | The University of Iowa | USA

    Karla McGregor, Ph.D., CCC-SLP, directs the Center for Childhood Deafness, Language & Learning at Boys Town National Research Hospital where she also serves as a senior scientist conducting research on Developmental Language Disorder in children and adults. She is a Professor Emerita at the University of Iowa and a founding member of You can access her publications here.


  • Stephen Parsons
    Stephen Parsons

    Chair | NAPLIC | UK

    Stephen is a Speech and Language Therapist (SaLT), trainer and author of practical language development resources for teachers and SaLT. He has over 30 years’ experience in the field, including 1996–2017 in Hackney and the City of London where he was Speech and Language Therapy Service Manager for a number of years. Stephen is co-author of best-selling resources ‘Language for Thinking’ and ‘Word Aware’ (primary and Early Years), as well as the recently released ‘Language for Behaviour and Emotions.’


    Stephen graduated in Speech Pathology from Flinders University in Australia, before attaining an MSc in Speech and Language Therapy from City University, London in 2000. He currently serves as Chair of NAPLIC, the UK organisation for professionals working with developmental language disorder, and UK representative of RADLD, the international campaign to raise awareness of developmental language disorder.  He is active on Twitter at @WordAware.


  • Shaun Ziegenfusz
    Shaun Ziegenfusz

    Co-Founder of The DLD Project, speech pathologist & PhD Candidate, Griffith University | AUSTRALIA

    Shaun Ziegenfusz is a certified practising speech-language pathologist with a Master of Special Education.  In previous work, Shaun has been responsible for research into the delivery of education and therapy programs for children with DLD and developing services to ensure optimal outcomes.  Shaun is currently researching the educational needs of students with DLD from the perspective of key stakeholders as a PhD candidate at Griffith University and Co-Founder of The DLD Project.


  • Anita Mei-Yin Wong
    Anita Mei-Yin Wong

    Associate Professor/Discipline of Speech Pathology, Faculty of Medicine and Health, University of Sydney, Australia

    Anita received professional training and has practiced as a speech-language pathologist in the United States and in Canada. Anita’s research in the last 20 years contributes to SLPs’ improved practice in norm-referenced language assessment, language sample analysis, and our collective understanding of the manifestations of DLD in children learning Cantonese, a popular variety of Chinese that is also her mother tongue.

    Anita is currently researching on a new theory-driven approach for complex syntax intervention for pre-primary children with DLD. Anita’s move from Hong Kong to the University of Syndey in 2022 provides her the opportunity to further extend her research to Chinese speaking children in linguistically diverse contexts. Anita is also hosting a new website where she curates resources on language development and language disorders for Chinese speakers and readers around the world.


    CLICK HERE for Anita’s Google School Page.

  • Natalie Turner
    Natalie Turner

    Co-Founder of The DLD Project | AUSTRALIA

    Nat is one of the Co-Founders of The DLD Project and has worked internationally with many small to large not-for-profit organisations in marketing, fundraising, advocacy and volunteer mobilisation. She is also a qualified journalist having worked as a radio announcer in Australia and more recently, as a freelance writer/videographer. She is inspired by the families who make up the DLD community, their stories and the potential of what can be achieved when we pool our talents and resources.


  • Sam Bolton
    Sam Bolton

    Administrative Assistant

    Sam is currently completing a Master of Speech Pathology at Griffith University, Australia and has a background in Biomedical Science and Public Health. Prior to returning to study, Sam worked as a Senior Project Officer for a not-for-profit organisation, supporting workforce development for health professionals through the delivery of education, training, policy, and advocacy projects. Sam has a keen interest in the application of public health approaches within the speech pathology field. 


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