Peter Twiss


BSc(Psych) Hons, BBA, MClinPsych, MAPS

Key Areas of Interest

  • Cognitive, Educational and Neuropsychological Assessments
  • Specific Learning Disorders (e.g., Dyslexia, Dyspraxia)
  • Insomnia and Delayed Sleep Phase
  • Obstructive Sleep Apnoea
  • Pain, Chronic Illness and Disability
  • Anxiety Disorders
  • Depression

Therapeutic Framework/Strategies

  • Cognitive Behaviour Therapy (CBT)
  • CBT for Insomnia (CBT-I)
  • Mindfulness
  • Motivational Interviewing
  • Evidence-Based Reading Intervention
  • Applied Behavioural Analysis (ABA)

About Peter

Peter enjoys working with children and adults across the lifespan to help them understand their strengths and weaknesses using evidence-based psychological assessment. His objective is to apply psychological assessment and intervention to help clients to understand their strengths and advocate for any adjustments they may need in educational and occupational settings. He is passionate about using psychological assessment and recommendations as a tool to help people navigate complex education and occupational systems effectively. The interaction between sleep and various neurodevelopmental disorders such as ADHD is also an interest area of Peter’s. While his main focus is on psychological assessment, he employs Cognitive Behaviour Therapy (CBT), Motivational Interviewing and transdiagnostic process approaches to therapy.

While studying his undergraduate degrees, Peter worked with families administering Applied Behaviour Analysis (ABA) programs to help children with Autism, and worked at Centrelink and at a recruitment agency supporting graduate selection. After this, he worked in a Defence workforce planning context as an analyst then conducted research on Organisational Climate and Unacceptable Behaviour while continuing ABA. His passion for working with families led him to resume study and complete a Master of Clinical Psychology.

He has practiced in community settings including the Western Bulldogs AFL Team, assisting facilitation of a mental health program as well as in hospital settings providing therapy and support for sleep disorders and chronic health issues. Peter has also practiced in school settings with CatholicCare, providing assessments for children from varied backgrounds including asylum-seekers and worked with teachers to implement recommendations. His passion for working with families to navigate educational challenges has led him to focus on paediatric assessment and intervention in his role at Northside Psychology.  

How Peter might support you

Peter’s broad experiences in community, Defence, human resources and the education system alongside his passion for using psychological assessment as a tool to help clients, provides a meaningful basis to help clients navigate a wide variety of challenges that they may face. He is committed to creating a safe, client-centred environment that supports his clients to achieve their goals.

Peter welcomes clients from all backgrounds. He particularly enjoys working with children and their families, assisting them to navigate educational systems and increasing the likelihood that their individual needs are met. Peter is skilled at assessing and providing interventions for sleep issues including insomnia, obstructive sleep apnoea, and delayed sleep phase. His highly structured approach to assessment and intervention helps clients to identify their goals and motivations, then open their minds to strengths and leverage them to remove barriers to success.

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