Dr. Sara O’Byrne, Senior Clinical Psychologist / Clinical Director

Dr Sara O’Byrne (BA, MSc, D Clin Psych) is a Senior Clinical Psychologist with over 12 years experience working with children, adolescents and their families within primary care, early intervention, and child protection services. Sara holds a doctorate in Clinical Psychology from Trinity College Dublin. Sara has established a private practice in Dublin since 2011. She provides teaching input to the doctoral course in clinical psychology in Trinity College Dublin and writes for various media outlets. Sara has particular interests and experience in providing developmental and autism assessments, supporting child’s mental health needs, and providing therapeutic services for children in care. Sara has additional training in attachment, autism spectrum disorders, the Incredible Years, The Circle of Security, developmental trauma, adolescent therapy, and narrative therapy. Outside of work Sara particularly enjoys travelling with her husband and two young children.


Dr. Marcus Dowling, Clinical & Forensic Psychologist

Dr Marcus Dowling (BA, MA Foren.Psych, D Clin Psych) is a Clinical Psychologist with over ten years’ experience working in psychology. He has developed extensive experience of child development from emotional, social, systemic, cognitive and forensic perspectives. Marcus has a Doctorate in Clinical Psychology from Trinity College Dublin. He is interested in attachment, systemic practice and child protection, with significant experience determining the needs of families, with a primary focus on giving voice to the child’s views. Marcus has completed further training in developmental psychometrics administration and interpretation at Trinity College Dublin.


Dr. Ciara Brien, Senior Clinical Psychologist

Dr Ciara Brien (BA Int. Psych, MSc, D Clin Psych) is a senior clinical psychologist with 10 years of experience working in the field of psychology. Initially specialising in clinical neuroscience, Ciara worked in the area of neuropsychology and rehabilitation with an emphasis on holistic assessment and person-centred care. Now, she draws on this knowledge of how the workings of the brain underpin our thinking, feeling and actions in her everyday work with children and families. Ciara has worked in primary care, children’s disability services, child and adolescent mental health services and in a specialist service for youth who have experienced abuse. She is particularly interested in attachment and infant mental health, developmental trauma and supporting parents and carers in supporting their children. 


Dr. Yvonne Quinn, Senior Clinical Psychologist

Dr. Yvonne Quinn is a Senior Clinical Psychologist who has worked for many years in HSE psychology services – both within child and adolescent mental health and primary care settings. Her interests include resilience and wellbeing, peri and post natal mental health and supporting families to promote positive mental health across the lifespan. She also has significant experience in neurodevelopment assessment.

She has completed additional training in areas including autism and developmental assessments and psychotherapeutic approaches such as Cognitive Analytic Therapy and infant mental health. Outside of work, she enjoys fresh air, keeping fit and hanging out with her four young children.

We also have two senior clinical psychologists who work on a seasonal basis here in treehouse practice.


“Out of your vulnerabilities will come your strength.”

- Sigmund Freud




Anne Holland, Psychotherapist

Anne Holland is a Psychotherapist with over 20 years experience working with children, adolescents, couples and families across primary care, school, community, and private settings. Anne has a background in paediatric and general nursing. In addition to her counseling and psychotherapy diploma Anne has also received further training in the Incredible Years, dyadic developmental psychotherapy, attachment, and parent-child interaction therapy. Anne has particular interests in attachment and supporting mental health within the community. In conjunction with Dr Pilar Bujia Couso, Anne was responsible for establishing and running a parent-child attachment focused service with the HSE. Anne offers supervision to other professionals working with children and families. From her starting point as a nurse, Anne has consistently maintained an interest in supporting children’s growth and development, as well as parent-child interactions. Anne is mother of two sons and has one beautiful granddaughter.


Richie Sadlier, Psychotherapist

Richie Sadlier is an accredited psychotherapist with a passion for working with adolescents and their parents.He is experienced in working with adults and adolescents with the following issues: Anxiety/Depression, Anger, Bullying, Grief/Loss, Personal Growth & Development, Relating/Relationships, School Refusal, Self-Confidence, Self-Esteem, Sexuality, Suicide.

In addition to managing his own private practice, Richie delivers six-week modules to Transition Year students in St Benildus college in both mental fitness and sexual health throughout the year. He also writes a monthly column on adolescence and mental health in The Irish Times and regularly speaks in secondary schools promoting positive well-being and help-seeking behaviour among the students.Richie holds an MA in Psychotherapy and a HDip in Counselling & Psychotherapy. He is presently completing an MSc in Adolescent Psychotherapy to enhance his strong commitment to supporting adolescents and their parents. With a background in sport, Richie also holds a BSc in Sports Science & Coaching.

He is an accredited member of the Irish Association of Humanistic and Integrative Psychotherapy (IAHIP)


“What you are to be, you are now becoming.”

- Carl Rogers


Occupational Therapists


Laura McDonnell, Senior Occupational Therapist

Laura obtained a general science degree from NUI Galway before completing a BSc in Occupational therapy from Brunel University in London. She has over 10 years experience in the field of paediatrics working in both the public and private sector.

Laura has extensive experience in the assessment and treatment of children with ASD, ADHD, DCD and Cerebral Palsy. She is a NDT qualified therapist and has completed Sensory Integration module 1 and Sensory integration "Is it Sensory or Behaviour?" and 24 Hour positioning for patients. Laura has also completed Sensory Attachment Integration (Level One) training.

Laura is a qualified OT student practice educator and has experience as a guest lecturer in the Certificate in Special Educational Needs (SEN) for Special Needs Assistants (SNAs) through St Angela's college. Outside of work Laura enjoys spending time with her husband and four young children. Laura is also an avid GAA fan.


Fiona Gilmore, Senior Occupational Therapist

Fiona graduated as an Occupational Therapist in 2011 and has worked in a variety of settings since then including; as part of a Children's Disability Team within the community supporting children with a wide range of intellectual, physical and sensory difficulties and in a number of Universities across Dublin providing Occupational Therapy support to students with disabilities.

Fiona strives to provide a family - focused, practical support to children and their families. She is a member of the Association of Occupational Therapists Ireland and the World Federation of Occupational Therapists. She is dedicated to continuous professional development and strives to uphold best practice guidelines.


Jennifer Donlon B.SC, Occupational Therapist

Jennifer is an occupational therapist with more than ten years’ experience of working with children, adolescents and families. Jennifer graduated from the Robert Gordon University, Aberdeen in 2007 and has worked in public and private health services with individuals from 0 to 18 years of age including Primary Care, Early Intervention and School Age Disability Services. Jennifer has a particular interest in the assessment and treatment of sensory processing and motor coordination difficulties and has undertaken further training dedicated to these areas. Jennifer is a member of the Association of Occupational Therapists of Ireland (AOTI) and of the UK Sensory Integration Network. Outside of work Jennifer enjoys spending time with her young family, living life in the fresh air and spending time with friends.


“It is not our disabilities, it’s our abilities that count.”

— Chris Burke


Play Therapists

Aisling Mulhern, Play Therpaist

Aisling Mulhern is a play therapist with a PG-Dip in Play Therapy. She works with children and adolescents from the age of three years. She works through the medium of play to allow children to communicate in their natural language and to enable them to explore problems that they can’t express in words. Aisling works with children with a range of issues including: anxiety, behavioural problems, parental separation, bereavement, poor social skills, autism spectrum disorder and developmental trauma. She also provides parenting support and skill building. Aisling is currently completing an MA in Child and Adolescent Psychotherapy with a Specialisation in Play.


“Play is our brain's favorite way of learning.”

-Diane Ackerman. 


Speech & Language Therapists


Caitríona O'Mahony, Senior Speech & Language Therapist

Caitriona is a Senior Speech and Language Therapist with over seven years experience working with children and adolescents with a wide range of communication difficulties in homes, clinics, preschools and schools. She studied in Manchester and has worked in Primary Care Services and Area Based Childhood Programmes with children and adolescents and their families. Caitriona is a Hanen It Takes Two to Talk and More Than Words Certified Clinician and Elklan Tutor. She has completed further training in speech sound difficulties, stuttering interventions, Lámh Signs, Intensive Interaction and ASD Level 2 Training. Caitriona emphasises and encourages learning to communicate through natural and fun activities. She offers a flexible, child-centred service and is eager to provide early intervention to all families.


“A warm smile is the universal language of kindness.”

- William Arthur Ward


Practice Team


Grainne Butler, Practice Manager

Grainne joined the practice in April 2017. She has a Bachelor of Commerce International from UCD and has over 10 year’s experience in various finance and administration roles. Grainne has worked in the Financial Services industry and for one of the country’s largest FMCG companies. Outside of work Grainne enjoys spending time with her young family and going for walks around beautiful Greystones.


Maire Kilgallen, Practice Administrator

Maire holds a BSc Hons in Psychology and has worked with paediatric multidisciplinary teams for the last 7 years. Maire previously worked in banking. Maire is married with 3 sons and is an avid sports fan. In her spare time Maire enjoys cycling, tennis & yoga .