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Meet the Team


Founder, Clinical Psychologist & AHPRA Supervisor

Narmatha (Narmi) Thillainathan

Adjunct Fellow (Macquarie University) FCCLP Clinical College |Aff. Ed&Dev Psych| Board Clin. Supervisor| MClin Psych | Msc Hlth Beh | Bsc Psych 

Narmi is a Clinical Psychologist, the founder of Breakthrough Psychology Practice, and also an Adjuct Fellow (Macquarie University), with 20 years of experience. She is the founder of Breakthrough Psychology Practice of 13 years in West Pennant Hills. She is also part of the teaching staff at UTS (Masters Clin Psych) and is an AHPRA supervisor to many psychologists in training. She is passionate about the work she does with her clients and thrives on empowering clients to lead a more fulfilled life.


Narmi loves working with diverse clients, and provides assessment and therapy to young children, adolescents, adults and families. Narmi utilises evidence-based practice in her clinical work and intuitively matches the best type of therapy suited to each client. This may include: Mindfulness, Cognitive Behaviour Therapy, Acceptance Commitment Therapy, Dialectical Behavioural Therapy, Compassion Focussed Therapy and Psychodynamic Psychotherapy. She has a special interest in neuro-affirming therapy and supporting parents.

Narmi leads the Testing Clinic and Breakthrough Psychology with 20 years of experience, and works collaboratively with her team to support clients with Diagnostic Assessments. She is also passionate about training and supervising psychologists, which is an integral aspect of her mission at Breakthrough Psychology, but also extends this support to external psychologists in training or otherwise. In addition to this, she also offers group training and consultations/school wide interventions and other organisations on topics such as parenting, anxiety management, programs, effectively managing ADHD and diagnostic assessments such as Child and Adult ADHD, Autism, SLD.

Administration Officer | Reception

Nathalie du Toit

Nathalie will be greeting you upon arrival, offering your cuppa and assisting you with bookings and all things admin.


Nathalie possesses a unique insight into the transformative power of therapy and mental health. She is passionate about helping clients feel welcomed, and is committed to making their experience at Breakthrough Psychology a positive one.

In addition, Nathalie is currently studying a Master of Professional Psychology (Institute of Social Neuroscience).


Nathalie is deeply passionate about the field and is dedicated to ensuring that every client's journey with us is both enlightening and empowering. During her free time, Nathalie enjoys hitting the gym for training sessions, expressing her creativity through drawing, shopping, and cherishing quality moments with her friends and family.


Nathalie works on Mondays (10am-6pm), Thursdays (12pm-6pm) and Fridays (10am-6pm)

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Registered Psychologist
Nadine Sarah
MPP | BA Psych | BSC Psych (Hon)

Nadine is an experienced Registered Psychologist, with a Professional Masters in Psychology from Macquarie University and an honours degree in Psychology. She has worked in complex systems, such as the Northern Beaches Hospital, Child Protection (data analysis) and Head to Health before entering private practice.

Nadine is passionate about working with adolescents and young adults. She loves sharing her knowledge of Psychology in assisting by transforming the lives of clients, who are experiencing anxiety, depression, adjustment, grief and loss, trauma.

She has most recently returned from Hatha & Asthtanga Vinyasa Yoga Teacher Training in Rishikesh, India. She balances this passion by her daily self-care practice of mindfulness, pranayama and yoga. By nature, Nadine is compassionate, calm, patient and non-judgemental in the way she engages with her clients.

Her orientation of work is client-centred, holistic and varies to suit each client. She is trained in Cognitive Behavioural, Acceptance and Commitment, and Mindfulness Therapies.

Nadine also speaks Tamil fluently.

Nadine is a member of the Australian Association of Psychologists incorporated (AAPi). 

Nadine is currently available on: Wed and Thur: 11-7pm


Registered Psychologist | Clinical Psychology Registrar

Andrew Sedger

MClin Psych| BSocSc Psych (Hons) | MEnv Law | BAppSc Env (Hons) | GradDip Comms

Andrew is a mature and motivated psychologist who brings a warm, curious, and calm approach to his work with adults, children, and parents. He draws on evidence-based techniques such as cognitive behaviour therapy, acceptance and commitment therapy, and narrative therapy to deliver personalised psychological support to each client. He is energised by helping people flourish in work, school, and life.


Andrew trained at the Western Sydney University Psychology Clinic, the Royal North Shore Hospital and a private Sydney paediatric clinic. He has experience helping people overcome difficulties with anxiety, depression, stress, relationship problems, work problems, burnout, self-harm, chronic pain, ADHD, ASD and learning difficulties.


As a second-career psychologist, Andrew is comfortable engaging with people from all walks of life. Before specialising in psychology, Andrew worked as a communication consultant, helping clients understand, solve, and explain complex issues. Andrew has a Bachelor of Social Science in Psychology (Honours) and a Master of Clinical Psychology and is currently completing a Clinical Psychology registrar program. Andrew also has qualifications in environmental science and law.


Outside of work, Andrew loves travelling and exploring the great outdoors by bicycle, motorbike or foot.


Provisional Psychologist
Simone Soliman
BSC (Psych) | GDip AdPsych | MMP

Simone is currently awaiting her registration as a Psychologist. She has several degrees, including a  Masters of Professional Psychology. 

Simone's area of passion is to work with children, teenagers and parents. She works with various presentations including: anxiety, stress, depression, adjustment difficulties, relationship difficulties, grief and loss, bullying, ADHD and Autism,

Simone has trained in modalities of Cognitive Behavioural Therapy, Acceptance & Commitment Therapy, Play Based Therapy. She is well versed with utilising Zones of Regulation, 123 Magic and Emotional Coaching, Cool Kids, Acceptance & Commitment Therapy for Children, Supporting Nuero-diverse children, (Autism, ADHD), Managing risk.

Simone is also the Testing Coordinator of the clinic and is involved in: Adult ADHD assessments, Child ADHD, Autism, Giftedness and Learning Disorder testing. These tests include: WISC, WIAT, Attention Tests, Autism Diagnostic Observation Schedule Assessment (ADOS). She works closely with the Clinic Director to support and facilitate the coordination of Diagnostic Testing at Breakthrough Psychology Practice.

By personality, Simone is highly personable, fun, caring and compassionate. She loves cooking and shopping in her spare time, and regularly practices self-care, by attending the gym.

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Provisional Psychologist

Ishan Narendran

Bsc Psch (Syd Uni)

Ishan is a dedicated and compassionate psychologist committed to guiding individuals on their path to mental well-being and personal growth. With a Bachelor of Science (First Class Honours in Psychology) from the University of Sydney, Ishan brings a solid foundation of knowledge and a passion for understanding the intricacies of the human mind.

One of Ishan’s defining qualities is his warm and caring personality. Ishan approaches his clients with genuine compassion and a non-judgmental attitude, creating a safe space for them to explore their thoughts and emotions. His ability to empathise and connect on a personal level fosters a therapeutic relationship built on trust and understanding.

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