Meet our team


Darin Cairns 
Clinical Psychologist | Clinic Director

Darin Cairns has over 17 years experience in treating children, adults and families for a range of psychological disorders. He has specialised in emotional, neurological and developmental disorders. Clinically, Darin has expertise in child, adolescent, family therapy and developmental disorders such as autism spectrum disorders. He also has extensive experience in adult mood disorders and works as a single expert witness. 

Darin is well known for his work with children, adolescents and adults with Autism Spectrum Disorders. Darin has set up award winning early intervention services in Western Australia for children with Autism Spectrum Disorders and related conditions. He was initially trained in Applied Behaviour Analysis (ABA), Clinical Behaviour Analysis and Functional Analytic Psychotherapy. After many years working with developmental specialists and clinicians his frustration at not being able to bridge the gap from ABA to complex behavioural and emotional domains lead him to Relational Frame Theory (RFT). He has since applied Relational Frame Theory (RFT) to hundreds of developmental programs for children with Autism Spectrum Disorders and special needs and continues to practice clinically using therapies developed from RFT such as Acceptance and Commitment Therapy (ACT) and other third wave Cognitive Behavioural Approaches.  

Darin has lectured at the tertiary level and has provided over 150 training courses to a wide range of populations in the medical, health and public settings.  He is a sought after speaker in the use of evidence based practice to promote psychological wellbeing and development around the world having been invited to speak in the UK, Europe, the US and most of Australia.

Tiffany Rochester
Clinical Psychologist

Tiffany Rochester is an AHPRA endorsed Clinical Psychologist with over 15 years’ experience working systemically with children, adults and families in a range of settings, including separation, divorce and Family Court issues; children involved in the justice system; families raising children with complex needs; survivors of abuse; perinatal mental health; and anxiety, stress, depression and grief across childhood, adolescence and adulthood. Tiff is passionate about the application of evidenced-based practice, and her clinical approach is informed heavily by Contextual Behavioural Science (CBS), including Acceptance and Commitment Therapy (ACT) and Compassion Focused Therapy (CFT).  


Tiff supports families through behavioural interventions for children; family therapy; couples therapy; and individual work.  She enjoys opportunities to run workshops and work collaboratively with schools and organisations, is an occasional speaker on CBS topics at corporate events, and has had CBS-informed articles published in professional magazines such as InPsych©. Committed to contributing to the science that underpins psychological practice, Tiff is also an Honorary Research Fellow at Telethon Kids Institute, conducting an ACT research trial for parents raising kids with Autism. Tiff has been serving on the Board of the ANZ Chapter of the Association for Contextual Behavioural Science since 2015 and is currently President Elect.  When she has time, she authors a CBS-infused Blog,

Katherine Smith
Registered Psychologist

Katherine Smith is a Psychologist, registered with the Psychology Board of Australia, with over 10 years experience working with children, adults and families with a variety of needs. Katherine also has experience in various positions working within the Department of Child Protection, the Department of Corrective Services and within supported accommodation for individuals with psychiatric disabilities, adopting a rehabilitative approach.

At The Charles Street Clinic, Katherine has worked in a number of roles. Having years of experience as a Developmental and Behavioural Therapist with children with Autism Spectrum Disorders Katherine provided Case Management services for the Early Intervention Program. In this role Katherine worked closely with parents and schools promoting empowerment in parents and encouraging a collaborative approach to the social, emotional and behavioural development of her clients.

As a Registered Psychologist, Katherine works together with children, adolescents and families as well as adults on a range of presenting difficulties including mood disorders, selective mutism and anxiety disorders. Katherine is trained in the provision of assessments for learning disability including dyslexia, as well as cognitive assessments, and assessments for ADHD.

Using evidence-based assessments, treatments and interventions, Katherine adopts principles from Applied Behaviour Analysis (ABA), Functional Analysis and Acceptance and Commitment Therapy (ACT).

Amy Campbell
Registered Psychologist

Amy Campbell is a Psychologist, registered with the Psychology Board of Australia. Amy began working in Early Intervention in 2010, working intensively with children on the Autism Spectrum and their families. She has comprehensive knowledge of childhood and developmental disorders and has worked collaboratively with schools and supported accomodation. 


Amy also has experience working with adults and children who have experienced trauma and those who have witnessed or been victims of violent crimes. She has trained in EMDR therapy and is passionate about providing evidence based interventions for individuals with PTSD. 


Amy works with both individuals and families and is dedicated to providing evidence-based interventions drawing on principles from Functional Analysis, Applied Behaviour Analysis (ABA) and Acceptance and Commitment Therapy (ACT). She is a member of the Australian Psychological Society (APS) and the Association for Contextual Behavioral Sciences (CBS). 

Sharon Jeyabalan
Clinical Psychologist Registrar


Sharon Jeyabalan is a Psychologist, registered with the Psychology Board of Australia, and a Clinical Psychologist Registrar who has over 7 years experience working with children and families with a variety of needs. Sharon recently completed her Masters in Clinical Psychology and completed placements in the areas of early intervention services for adolescents as well as children with trauma and attachment difficulty backgrounds. Sharon was trained to utilise a range of assessment tools including cognitive and educational. Sharon’s research project was to examine the effectiveness of an Acceptance Commitment Therapy (ACT) approach for children with high levels of anxiety. She conducted group therapy sessions with children and their parents, following a protocol she designed under the supervision of Mr Darin Cairns, Clinical Psychologist and Director of The Charles Street Clinic.

At The Charles Street Clinic, Sharon has years of experience as a Developmental and Behavioural Therapist for children with Autism Spectrum Disorders. She works closely with parents and schools utilising a collaborative, systemic approach to the social, emotional and behavioural development of her clients.

Sharon works with children and families, as well as adults, on a range of presenting difficulties including anxiety, stress, depression and selective mutism. She also has experience working with adolescents with complex needs and has a keen interest in this area, particularly trauma. Sharon adopts principles from Applied Behaviour Analysis (ABA), attachment theory, functional analysis and Acceptance and Commitment Therapy (ACT).

Rachel Gallagher
Educational and Developmental Psychologist | Clinical Psychologist | Clinic Director

Rachel Gallagher is an AHPRA endorsed Educational and Developmental Psychologist and Clinical Psychologist with over 18 years of experience working with children and adolescents with developmental disability. Rachel has expertise in the assessment and treatment of individuals with autism spectrum disorders, learning difficulties and special needs. She also specializes in children and adolescents with anxiety disorders. 


Rachel adheres to only assessments, treatments and interventions that are supported by evidenced based research promoting the best outcomes for her clients. 


Rachel is currently undertaking her PhD at Edith Cowan University and is examining predictors of depressive symptoms in adolescents with Autism Spectrum Disorders.

Speech Pathology

Sjaan Lucas
Speech Pathologist 

Sjaan Lucas is a Certified Practicing Speech Pathologist (Speech Pathology Australia), and is experienced in the assessment of and providing therapy and intervention for a range of speech and language delays and disorders. Sjaan is trained in the More Than Words® Hanen Program®, PROMPT and Basic Key Word Sign.

Sjaan has worked with The Charles Street Clinic since 2012 with children with Autism Spectrum Disorder, anxiety, and developmental and behavioural difficulties. She is a strong advocate for early intervention and works collaboratively with caregivers and schools to design goals that assist clients in developing the skills required to achieve independence and success in their individual contexts. 

Sjaan has a particular interest in Autism Spectrum Disorder, fluency (stuttering), and childhood speech sound disorders.Sjaan also enjoys working in the areas of phonological awareness and written language, and general language difficulties. Sjaan works within the age range of toddlers to teenagers.

Bianca Piano
Speech Pathologist

Bianca is experienced in the assessment, diagnosis and treatment of speech and language disorders. She is a certified practising member of Speech Pathology Australia (SPA) and is particularly interested in expressive and receptive language delay, feeding, alternative and augmented communication (AAC), speech sound disorders, phonological awareness and social communication.

Bianca has worked in the area of Autism for six years across early intervention and school aged therapy, and she is experienced in working with clients with complex behaviours.

She enjoys working with parents and schools to develop goals which improve communication success. Bianca works with paediatric and adult clients across a range of delays and disorders.

Behavioural & Developmental Therapists

Our early intervention behavioural and developmental therapists are professional and committed people who are dedicated to assisting families and children to reach their potential and goals in life. We provide behavioural and developmental therapists to most suburbs around the Perth Metropolitan area including the eastern, western, northern and southern suburbs.


Our therapists have all been through our comprehensive and intensive training program. They all receive ongoing regular supervision and support and are committed to long-term therapy with the families they work with. Our therapists have acquired skills training in (1) Pivotal Repose Training (2) Natural Environmental Training (3) Applied Behaviour Therapy (4) Independent, paired or group Social Skills Training and (5) Shadowing in day-cares, Kindergartens and Primary School settings. Our team members have different educational experiences. Some of our therapists are studying towards a university degree in Speech Pathology, Clinical Psychology, or Occupational Therapy. Some already hold a degree and for others, a role as a behavioural and developmental therapist is their chosen career as result of extensive experience in the field prior to working with us.


The behavioural and developmental therapists all share common traits of patience, problem solving abilities, flexibility, a sense of humour and a positive outlook.


Dana Jones
Medico-Legal Secretary

Dana has a Certificate of Medical Reception from the AMA and a Certificate of Hospitality.  She has extensive experience working in medical practice management, medico-legal practice management, executive assistant and legal secretary roles. Prior to Dana’s role at The Charles Street Clinic she worked in the WA Government Public Sector as a Legal Secretary. With her years of experience in the administrative and management roles working with General Practitioners, Orthopaedic Surgeons, Clinical Psychologists and Government Solicitors she provides a wealth of knowledge relevant to her role as medico-legal secretary. Dana can assist with matters related to Single Expert Witness assessments for the Family Court, Children’s Court and Department of Communities Child Protection and Family Support.

Katrina Challot
Office Manager 

Katrina has extensive experience working in secretarial and sales roles in both public and private sectors.

Prior to Katrina’s role at The Charles Street Clinic she worked as Executive Assistant in the Rugby WA Community and was previously employed in the WA Government Public Sector as a Legal Secretary.

Katrina can assist with matters related to day to day administration.