Taking the first step towards seeking help and support for yourself or someone you care about is an act of courage - and we’re right there with you.
Aperture Psychology is a private psychology clinic in Sydney, NSW, dedicated to supporting adults, teens and children through therapeutic treatments and cognitive and diagnostic assessments.
The change we want to make:
Our Vision
Use scientific understanding to improve mental health and unlock human potential
How we make it happen:
Our Mission
We provide evidence-based psychological services that empower individuals to gain deeper insight, develop their capabilities, and create meaningful change in their lives through compassion, expertise and collaborative partnership.
The belief that guides us:
Our Values
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Wisdom first
We pursue deep understanding of the human mind and share knowledge that helps transform lives.
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Human dignity
We honour the inherent worth and potential in every person.
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Skillful compassion
We combine professional excellence with genuine care for the people we serve.
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Meaningful growth
We facilitate lasting positive change for our clients through insight and action.
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Collaborative Spirit
We work together as a team and with other health professionals to amplify our positive impact on individuals and communities.
How did we get here?
25+ years ago, it all started with a simple idea: two people with a shared vision for providing psychological care to their local community.
We wanted to use our expertise in the field to build a place where anyone experiencing mental health challenges felt comfortable and safe coming to us for guidance and relief.
From the beginning, the practice offered support for anxiety, depression, and couples in distress, and adopted emerging evidence-based approaches for the treatment of psychotic disorders and bipolar disorder.
As the team grew, so did our desire to support people facing mental health challenges, as well as individuals and families navigating developmental conditions and cognitive difficulties.
From Past to Present
Now, in 2025, as we step into the next chapter as Aperture Psychology, we’re building on our experience, values, and passion for helping people - expanding our services to make psychological care and education more accessible.
Meet the Practice Directors
Hi, I’m Peter
For me, psychology has always been about connection - listening to people’s stories, really understanding what they are going through, and working together to address the core of their concerns. It's personally rewarding to see the transformative impact the right therapy can have on someone’s life. As the Director of Clinical Psychology & Education at Aperture Psychology, I’m proud to lead a team of highly skilled clinical psychologists who share my passion for delivering clinically proven treatments that empower people to take control of their mental health.
When I’m not in the practice you’ll likely find me engaged in physical activities (I’m an avid surfer!), enjoying a good laugh with the family, or diving into the surreal world of a David Lynch film - because mental health is all about maintaining balance.
Peter Walker
Director of Clinical Psychology & Education
BSc(Hons), MPsych(Clin)
Hi, I’m Sophie
If you were ever curious about how the brain influences the way we think, feel, or act - welcome to my world. I’ve always been fascinated by the connection between brain function and behaviour and this made stepping into my role as Director of Neuropsychology and Operations at Aperture Psychology feel like a natural progression. Here, my team and I take a research-driven approach to help individuals and families get clarity on and make sense of cognitive and behavioural challenges.
I love all things natural history (dinosaurs and David Attenborough!) and ancient history. In my spare time, I hang out with the family and occasionally indulge in my love of zombie movies.
Dr. Sophie Li
Directorof Neuropsychology and Operations
BPsych(Hons), MPsych(Clin), PhD
A psychology practice is only as strong as the people behind it.
Meet the team.
Toni Gumley
PRACTICE MANAGER
Toni is the warm and welcoming human you’ll see behind our front desk (or hear when you call us).
Her superpower - besides making sure everything’s running smoothly at the practice? Her ability to match clients with the right clinicians.
After over 10 years working with us, she has a wealth of knowledge and is always happy to answer your questions.
Our Psychologists
All of our clinical psychologists have undergone extensive training in the implementation of evidence-based approaches either through Masters, Doctorate or combined PhD/Masters degrees in Clinical Psychology.
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Dr Aliza Werner-Seidler
CLINICAL PSYCHOLOGIST
BPsych(Hons), MPsych(Clin), PhD
Aliza can help you with: Sleep difficulties, Anxiety, Depression
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Tamara Kacen
CLINICAL PSYCHOLOGIST
BPsych(Hons), MPsych(Clin)
Tamara can help you with: Anxiety, Depression, Stress and Adjustment, Relationship Difficulties, Chronic Physical Health Issues
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Dr Yasmeen El Masry
CLINICAL PSYCHOLOGIST
BPsych(Hons), MSci, DClinPsych
Yasmeen can help you with: Anxiety Disorders, Depression, Low Self Esteem, Phobias, Perfectionism. Yasmeen can see CTP clients
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Dr Vesna Trenoska
CLINICAL PSYCHOLOGIST
BA(Hons), MPsych(Org), MPsych(Clin), PhD
Vesna can help you with: Anxiety, Stress, Trauma, OCD
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Christopher Evans
CLINICAL PSYCHOLOGIST REGISTRAR
BSc(Hons), MPsych(Clin)
Christopher can help you with: Anxiety, Depression, ADHD
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Dr Oren Griffiths
CLINICAL PSYCHOLOGIST
BSc(Hons), MPsych(Clin)(Hons), PhD
Oren can help you with: Anxiety, Depression, Psychosis, Schizophrenia
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Maria Schaffer
CLINICAL PSYCHOLOGIST
BSc(Hons), MPsych(Clin)
Maria can help you with: Anxiety, Depression, OCD, Trauma, Clinical Perfectionism, Low Self Esteem, Panic Disorder, ADHD Assessments. Maria is SIRA accredited and can see workcover and CTP clients
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Daniel Stein
CLINICAL PSYCHOLOGIST
BPsych(Hons), MPsych(Clin)
Daniel can help you with: Anxiety, Depression, Anger. Trauma, Perfectionism, Stress and Adjustment, Relationship difficulties, Workplace related difficulties, ADHD
Daniel is workcover accredited. -
Roanna Chan
CLINICAL PSYCHOLOGIST
BPsych(Hons), MPsych(Clin)
Roanna can help you with: Anxiety Disorders, Depression, Trauma
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Dr Zeeshan Shahnawaz
CLINICAL PSYCHOLOGIST
BSc(Hons), MSci, DClinPsych
Zeeshan can help you with: Depression, Anxiety, Grief, Mood Disorders
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Peta O'Flynn
CLINICAL PSYCHOLOGIST
BSc(Hons), MPsych(Clin)
Peta can help you with: Anxiety, Depression, Phobias
CURRENTLY NOT ACCEPTING NEW CLIENTS
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Dr Samatha Tang
CLINICAL PSYCHOLOGIST
BPsych(Hons), MPsych(Clin), PhD
Samantha can help you with: Anxiety, Depression, Perfectionism.
CURRENTLY ON RESEARCH LEAVE, NOT ACCEPTING NEW CLIENTS
