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Meet our


Dr. David H. Demmer

Clinical psychologist & Co-founder of Macquarie Street Psychology


Dave received his Bachelor of Psychology (with honours) and his Doctorate of Psychology (Clinical) from Deakin University, Australia. Dave has a clinical and research background in men’s mental health and the mental health of the LGBTQIA+ community, working closely with these populations since the beginning of his career. Dave’s therapeutic style is collaborative, authentic, and strategy-focused. As well as 1:1 talk therapy, Dave is trained in couples therapy and holds a diploma of clinical hypnosis.


As well as private practice, Dave has worked clinically within the private hospital sector with both community and acute populations and as a university lecturer. He is also the current Chair of the Australian Psychological Society (APS) College of Clinical Psychologists Victorian Committee. 

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Dr. Beau Growcott

Psychologist & Co-founder of Macquarie Street Psychology


Beau is a registered psychologist with both academic training and real-world experience. He is an LGBTQI-friendly practitioner with an empathic, pragmatic, and collaborative approach. He combines cognitive-behavioural techniques (CBT), with Acceptance and Commitment Practices (ACT), and Motivational work.  


Beau also specialises in hypnosis. His post-graduate studies examined the mechanisms and effectiveness of hypnosis, and he has significant training and experience with the practice.

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Dr. Bella Marker

Clinical Psychologist


Dr. Bella Marker is a registered psychologist and a member of the Australian Psychological Society. She received her Doctorate in Clinical Psychology at Monash University where she focused on anxiety disorders. 


Clinically, Bella adopts a compassionate and holistic approach when working with clients. She is a LGBTIQ+ friendly practitioner trained in Compassion-Focussed Therapy, and believes in the importance of empathy, collaboration, and a non-judgmental attitude.

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Mr. Rocco Mammoliti



Rocco is a registered psychologist with experience and training working with adults, adolescents and children. He has experience treating a variety of psychological difficulties; his areas of interest include trauma, life transitions, grief, relationship problems as well as issues related mood and anxiety.


Rocco is passionate about LGBTQIA+ mental health, men’s, and adolescent mental health. He has worked in various schools in Victoria performing assessments or providing the advocacy and emotional support that is integral to a young person’s development.

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Dr. Julia Nazarewicz



Julia is a registered psychologist and member of the Australian Psychological Society. She received her Doctorate in Clinical and Forensic Psychology at Swinburne University of Technology, where her doctoral research focused on women’s perpetration of intimate partner abuse.


She has experience working with a number of clinical presentations and psychosocial difficulties, including anxiety, depression, OCD, hoarding, personality disorders, schizophrenia, stress, relationship problems, self-esteem, assertiveness, legal concerns and problematic/offending behaviours.

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Dr. Jamie Byrne

Clinical Psychologist


Dr. Jamie Byrne (pronouns: she/her) is a registered clinical psychologist who works with adolescents (12+) and adults. She has experience working with a range of concerns including: mood, anxiety, sleep, trauma, substance use, gender identity, and sexual orientation.

Jamie takes a humanistic and positive psychology approach to her practice. In developing a working relationship with clients, she values collaboration, authenticity, respect, and empathy. Jamie draws on a range of evidence-based approaches to collaboratively develop an individually-tailored treatment plan suited to the needs of each client. Her approach is to consider mental health concerns in the broader context of an individual’s life, personal narrative, and current circumstances

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Dr. Julia Hosie



Julia Hosie is a registered psychologist and member of the Australian Psychological Society. Julia is an LGBTQIA+ friendly practitioner and adopts a non-judgemental, pragmatic and holistic approach to working with clients.  She has worked with a variety of inpatient and outpatient clients in both community and forensic settings. She has experience working with a number of clinical presentations and psychosocial difficulties, including anxiety, depression, OCD, personality disorders, schizophrenia, stress, self-esteem, assertiveness, anger management, problematic/offending behaviours. She has undertaken training and has experience in cognitive behavioural therapy (CBT), acceptance and commitment therapy (ACT), schema therapy, emotion focused therapy, social and coping skills training and educational/cognitive assessments.

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Dr. Angie Montgomery

Health Psychologist


Dr Angie Montgomery is a registered Health Psychologist with experience in private practice, public health and workplace mental health and wellbeing. Angie is focused on creating a safe and compassionate space to work with her clients as they navigate challenges such as work-related stress or burnout, anxiety, trauma, life changes, grief and loss, or mood issues such as depression or anger. 

Angie works across a range of treatment modalities including Cognitive-Behavioural Therapy (CBT) and Acceptance and Commitment Therapy (ACT). Her style is compassionate, collaborative and goal oriented.

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Ursula Silverstone

Practice Manager


Ursula has a background in administration and manages the day-to-day operations of MSP. Ursula is currently working towards her registration as a psychologist having completed an undergraduate degree and honours in psychology. She is currently completing her Masters of Clinical Psychology.


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