Early Intervention for Children with Autism in Sutherland Shire
Mosaic Early Intervention designs specialised programs for children with Autism Spectrum Disorder (ASD) and other developmental delays.
We are based in the Sutherland Shire, Sydney NSW. Our passionate, experienced team provides behavioural, school support and early intervention programs tailored to your child’s and families needs.
Our Team
Clinical Director
Ashleigh O’Connor
BSpHSc, Grad Cert (Autism St), MEd (ABA), BCBA, CBA, Behaviour Support Practitioner
Ash is the Clinical Director at Mosaic Early Intervention, where she leads with a passion for improving the lives of children and families. She holds a Bachelor’s Degree in Speech and Hearing Sciences from Macquarie University, a Graduate Diploma in Autism Studies from Griffith University, and a Master of Education in Applied Behaviour Analysis from Monash University.
With extensive expertise in behaviour analysis, Ash is a Board Certified Behaviour Analyst (BCBA ), a Certified Behaviour Analyst (CBA) and a registered Behaviour Support Practitioner. Her dedication to evidence-based practices and compassionate care drives her commitment to fostering positive outcomes for children with developmental disabilities.
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Ash has been supporting children and their families, using the principles of ABA since 2012. She has a special interest in teaching functional communication and life skills to children with Autism Spectrum Disorder (ASD) and other learning difficulties.
Ash’s career is lead by a strong belief in the impactful nature of quality early intervention and personalised support. She is dedicated to delivering high-quality, effective programs rooted in evidence, embracing neurodiversity, compassionate care and tailored to harness the strengths, uniqueness and preferences of every child.
Learn more about Ash and the story behind Mosaic Early Intervention.
Clinical Team Leader
Amanda Valderrama
BBehSc, Grad Cert (ABA), M.Couns, CBA, Behaviour Support Practitioner
Amanda completed a Bachelor of Behavioural Science in 2014, and a Master of Counselling in 2016 at the University of Notre Dame. As a part of her Masters degree, she completed her university placement, undergoing face-to-face counselling and facilitating mental health workshops for adolescents.
Amanda is a Certified Behaviour Analyst, Program Supervisor and registered Behaviour Support Practitioner.
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Amanda completed her Graduate Certificate in Applied Behaviour Analysis in 2020 and is working towards her certification as a Board Certified Behaviour Analyst.
During her studies, Amanda volunteered in schools, and in social skill groups for children with Autism Spectrum Disorder (ASD). Amanda focused her Masters’ research paper on the benefits of parental involvement in family-centered interventions for children with ASD. Since then, Amanda has worked as an in-home Senior ABA therapist and pre-school shadow on several teams, with children between the ages of 20 months to 7 years old, before beginning her role as Behaviour Consultant.
Administration Officer
Amy Harmer
Amy is the Administration Officer at Mosaic Early Intervention. The face behind the phone and computer, the one who manages the day to day aspects of our services.
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Account Manager
Jessica McKay
Jess is the Account Manager here at Mosaic Early Intervention. After her Higher School Certificate Jess went on and completed a Traineeship that provided an accreditation in Banking and Finance and went on to work in banking for over 5 years. Jess received notable media attention for being an advocate for alternative pathways to professional careers outside of those associated with traditional university degrees.
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Since banking Jess worked in various law firms for 8 years. Since having a child of her own, Jess’ passion has been to work with children. Jess is someone who is always happy to help and is very dedicated to her job. Jess’ cheerful nature projects throughout the Mosaic office and has a lasting effect. This, coupled with her dedication to her managerial duties, makes her a key team member of the Mosaic Early Intervention Team.
Program Supervisor & Behaviour Support Practitioner
Callie MacGregor
BPsychSc (Hons), M(ABA), CBA, Behaviour Support Practitioner
Callie has completed her Bachelor of Psychological Science (honours) at the University of Wollongong and a Master of Applied Behaviour Analysis at Monash University. Callie is a Certified Behaviour Analyst (ABA Australia) and is working towards her certification as a Board Certified Behaviour Analyst (BACB).
Callie’s passion for ABA grew when she started working as a Therapy Assistant at Mosaic Early Intervention in 2020. Callie is now a Program Supervisor adn Behaviour Support Practitioner.
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Developing her passion for working with children through her experience as a dance teacher for children between the ages of 2-15, Callie has a keen interest in working with children with ASD and other developmental delays. Callie understands the integral role of the family dynamic and enjoys working closely with families.
Callie enjoys being active and playing team sports. She is excited to bring her energy, empathy and understanding to each session and is looking forward to watching each child reach their goals.
Program Supervisor & Behaviour Support Practitioner
Gabriella Musumeci
BPsychSc, Grad Cert (Autism St), Behaviour Support Practitioner
Gab is passionate about supporting children with additional needs and helping them thrive. She completed her Bachelor of Psychological Science in 2022 at the University of New South Wales, where she developed a strong interest in developmental psychology.
Driven by this passion, Gab went on to complete a Graduate Certificate in Autism Studies at Griffith University and is currently undertaking her Master of Applied Behaviour Analysis.
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Gab begun her career in ABA with Mosaic Early Intervention working as a Behaviour Technician. Gab has experience working with a number of children across all their different environments (home, school, community), and has since moved into a Senior Behaviour Technician role. At Mosaic, Gab brings warmth, dedication, and a commitment to evidence-based practice as she moves into the role of Program Supervisor.
Gab’s empathetic and caring nature helps her to create a friendly learning environment and build positive relationships with children and their families.
Program Supervisor & Behaviour Support Practitioner
Lauren Kasbarian
BPsychSc, MABA
Lauren brings a strong academic foundation and a passion for supporting children and families. She completed her Bachelor of Psychological Science in 2022 at the University of Wollongong, followed by her Advanced Graduate Diploma of Psychology in 2024.
Lauren has completed her Master of Applied Behaviour Analysis at Griffith University.
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At Mosaic, Lauren began as a Therapy Assistant, then Senior Therapist and now she is moving into the position of Program Supervisor, where she prioritises evidence-based practice, supporting children to reach their goals, and working closely with families to create positive and meaningful outcomes.
Lauren is committed to growing her knowledge in behaviour analysis and making a real difference in the lives of the children and families she supports.
Registered Psychologist
Hannah Wise-Mann
BSc (Hons), PG Dip MHP, PG Cert CBT-BA
Hannah has a wealth of experience working in the field of psychology, and trained as a Psychologist in the UK where she worked for 10 years before emigrating from the south of England.
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Hannah is a fully trained Cognitive Behaviour Therapist with over 12 years experience working with anxiety and depression for adults and children alike. Hannah initially focused on disorders of anxiety and depression and now specialises in Autism Spectrum and other neurodevelopmental Disorders. She has experience with working under an Applied Behaviour Analysis framework and has been offering therapeutic input for all levels of the Autism Spectrum for a number of years. Hannah’s primary area of research currently is the recognition and diagnosis of ASD in girls.
Hannah’s range of experience allows her a unique insight into the difficulties for all people involved when a child receives a neurodevelopmental diagnosis.
Therapy Assistant
Alyssa Kafetzi
BPsych
With a background in dance performance and teaching, Alyssa discovered a passion for working with children and supporting their growth. She is committed to helping children develop confidence and achieve their potential across a wide range of skills.
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Alyssa is passionate about supporting children of all ages and developmental stages, creating a safe, nurturing, and fun environment where they can thrive. She is dedicated to helping each child work towards their individual goals, while also involving and empowering families to be an active part of their child’s journey.
Therapy Assistant
Ella Lythall
BPsychSc
Ella holds a Bachelor of Psychological Science from the University of Wollongong and began her journey with Mosaic Early Intervention while completing her degree. She has a strong background supporting neurodivergent children, including experience teaching swimming in ways that honoured each child’s individual strengths and communication styles.
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Ella brings warmth, patience and a deep respect for neurodiversity to her work. She is committed to building trusting, supportive relationships with the children and families she works with, and tailors each session to align with the child’s interests, goals and preferred ways of learning. Ella is creative, thoughtful and full of positive energy, helping children feel confident, valued, and motivated as they grow and develop in their own unique ways.
Therapy Assistant
Hannah Bunyon
BPsychSc
Hannah holds a Bachelor of Psychological Science from the University of New South Wales and joined the Mosaic Early Intervention team during her studies.
With a natural passion for working with children, she quickly found her stride as a Behaviour Technician and has recently stepped into a Senior Behaviour Technician role.
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Hannah is known for her warm, friendly nature and her ability to build strong, trusting relationships with the children and families she supports. She brings a positive energy to every session, making therapy engaging, playful and meaningful. Her creativity, patience and genuine care help children feel safe, motivated and confident to learn. Families appreciate her collaborative approach and the way she celebrates each child’s unique strengths and progress.
Therapy Assistant
Kristal Lockwood
Kristal is a third‑year Psychology student at the University of Wollongong with a strong passion for supporting children’s development. She brings experience in childcare, teamwork and mental‑health training, and is dedicated to creating positive, structured environments where children can build confidence, independence and meaningful skills.
Therapy Assistant
Abby Law
B.PsychSc, B.SocSci (Crim)
Therapy Assistant
Taylor Pollard
Taylor is completing a Bachelor of Psychology (Honours) at The University of Sydney and has over seven years’ experience supporting children aged 1–17. With a background in dance, OSHC, social support and tutoring, she brings a warm, strengths‑based approach. Taylor creates engaging, inclusive environments and incorporates creativity and movement to help children feel confident, understood and motivated.
Therapy Assistant
Jessica Handley
Jess is studying Primary Education at the University of Wollongong and plans to complete a Master’s in Autism and Neurodivergent Studies. She loves supporting children to achieve their personal goals and brings enthusiasm, patience and a genuine passion for learning. Outside of work, Jess enjoys music and plays the oboe.
Therapy Assistant
Sienna Galati
Sienna is a Psychology (Honours) student working toward becoming a child psychologist. She is patient, caring and dedicated to creating calm, positive spaces where every child feels safe and valued. She enjoys getting to know each child individually and supporting their unique strengths. In her spare time, she loves walking and spending time with family and friends.