Advantage Psychology is a family-owned practice led by Directors Mitch and Ashleigh O’Brien.

They are proud to support a team of dedicated, compassionate psychologists, alongside an experienced support team who share a strong commitment to community wellbeing and the mental health sector. Together, the Advantage team works to create a warm, professional environment where both clients and clinicians feel supported every step of the way.

ASHLEIGH OBRIEN
MANAGING DIRECTOR

Ashleigh O’Brien is the Managing Director of Advantage Psychology Group. Bringing 15 years of executive management experience, Ashleigh leads the people and commercial outcomes for the group.

Passionate about building a values-driven culture where continuous improvement is part of the everyday, Ashleigh values streamlined systems, practical business processes, and creating a meaningful difference in the Western Sydney community we serve.

She holds a Bachelor of Communications and Media, a Master of Business Marketing, a Master of Business Administration, is a Graduate of the Australian Institute of Company Directors, and has served as a Director on several on not-for-profit and industry boards.

Jo NEAL
Practise MANAGER - ROUSE HILL

Jo Neal is the Practice Manager at our Rouse Hill clinic and brings a wealth of experience in healthcare administration and client services.

Jo is passionate about creating a smooth, welcoming, and efficient experience for both clients and clinicians. Her warm, friendly nature is paired with a sharp eye for detail and a proactive approach to keeping things running seamlessly behind the scenes.

Currently completing further study in Nutrition, Jo brings both professionalism and care to her work — helping make our Rouse Hill clinic a calm and supportive space for everyone who walks through the door.

CHarlotte SMITH
GROUP OFFICE MANGER

Charlotte Smith a friendly face regularly seen at our clinics, where she has been a valued member of the Advantage Psychology team for several years.

Currently studying a Bachelor of Social Work at Western Sydney University, Charlotte brings genuine passion for helping people and a deep understanding of the importance of accessible, compassionate care.

Known for her bubbly personality and kind-hearted approach, Charlotte keeps our St Marys practice running smoothly behind the scenes with training, systems and accounts support across both Rouse Hill and St Marys to further our commitment to excellence when it comes to our client experience.

BELLA MASTERS
RECEPTION & CLIENT CARE OFFICER

Bella is part of our administration team at Rouse Hill, helping clients feel welcome and supported from their first enquiry through to ongoing appointments. She brings experience in customer service, administration and teaching, along with a friendly and organised approach to every interaction.

Currently studying a Bachelor of Psychology (Honours) at Australian Catholic University, Bella has a keen interest in understanding and supporting others. Her background as a dance teacher has strengthened her ability to connect with people of all ages, bringing patience, clear communication and care to her work.

MITCH O’BRIEN
Clinical Director

Mitch O’Brien is the Clinical Director of Advantage Psychology Group. Alongside his leadership role, Mitch continues to work with clients as a Clinical Psychologist. He brings over 20 years of experience in business ownership and more than a decade of clinical practice.

Mitch is committed to our delivery of high-quality, evidence-based psychological care, while fostering a supportive environment for professional development. He values simplicity, practicality, and lifelong learning.

Mitch holds a Master of Clinical Psychology, a Bachelor of Psychology, a Bachelor of Commerce, and a Master of Commerce. He is also an AHPRA Board-approved supervisor.

Rienna DUPRIEZ
PRACTICE MANAGER - ST MARYS

Rienna is our Practice Manager at St Marys, bringing over 18 years of experience in administration, leadership and business operations.

Rienna cares deeply about helping others and brings a wealth of industry and practical experience. Before joining Advantage, she spent four years within national allied health, holding roles in intake leadership, administration management and office management.

With a strong understanding of client care and allied health services, Rienna brings a calm and steady support the local team and helps makes every client experience with the practice a welcoming, smooth and supportive one.

DAWN SABLJAK
RECEPTION & CLIENT CARE OFFICER

Dawn is an Admin and Therapy Assistant currently completing her Masters in Clinical Psychology at Western Sydney University. She brings a warm, empathetic, and person-focused approach to every interaction, ensuring clients feel welcome and clinicians feel supported.

Through her volunteer work, Dawn is experienced in supporting women who are navigating the child protection system and working toward reunification with their children. She offers practical assistance, emotional support, and a calm presence during complex life changes.

Dawn has a special interest in trauma-informed care, child psychology, and the psychological wellbeing of women.

SUMMER MULLINGER
RECEPTION & CLIENT CARE OFFICER

Summer is a friendly face within the Reception team at Rouse Hill.

With a background in medical reception and client care, she is an experienced healthcare professional, and a reliable support to the clinical team.

Whether its helping clients to find the right clinician, set up appointments, or handle referrals and billing enquiries, Summer has a knack for getting the job done efficiently while helping people feel welcome and at ease.

Warm, approachable and organised, Summer can always be relied upon to bring a welcoming smile and a helping hand.

RosEanne azzopardi
RECEPTION & CLIENT CARE OFFICER

Rosie is an Administration and Therapy Assistant who is studying her Bachelor of Psychology at Macquarie University.

With a calm and friendly approach, Rosie plays a key role in supporting both our clients and clinicians at our Rouse Hill Clinic. She brings a wealth of experience from work within school settings and as a therapy assistant in child behaviour programs. Rosie is valued as a steady presence at the front desk or behind the scenes.

Her ability to balance efficiency with genuine care ensures that our administrative processes run smoothly, our clinicians can focus on what they do best, and our clients feel supported every step of the way.