Dr David H. Demmer

BPsych(Hons), DPsych(Clinical), MAPS, FCCLP

Founder, Director, and Clinical Psychologist

Dave received his undergraduate degree (with honours) in psychology and his Doctorate of Psychology (Clinical) from Deakin University. Although Dave has broad clinical interests and works with many different people and psychological issues, he tends to focus his practice within the LGBTQIAP+ community. He has a clinical and research background in how gender and sexuality influence mental health. Dave works across most psychological disorders but has a particular interest in issues related to trauma, attachment, self-worth/self-esteem, substance-related issues (particularly methamphetamine use), and relationship problems. Dave’s main approaches are schema therapy, Emotion Focused Therapy (EFT), Acceptance and Commitment Therapy (ACT), and Cognitive Behavioural Therapy (CBT). He is also trained in couples therapy (Gottman Therapy) and holds a diploma of clinical hypnosis. Dave is also available for WPATH assessments for individuals who may require this as part of their gender affirmation/transition process.

Dave is passionate about both 1:1 and group therapy, and developed and facilitated Australia’s first multidisciplinary private outpatient program tailored specifically for men that combined psychological therapy with exercise physiology. Dave previously held the position of lecturer at Deakin University, where he chaired the counselling and coaching units. He has been the principle researcher on numerous areas of clinical research into the relationships between gender, sexuality, and mental health, and continues to supervise postgraduate students completing research in this area. Dave also consults to Movember as a mental health Subject Matter Expert. Dave is a AHPRA PsyBA board-approved supervisor. As the Director of Wellington Street Psychology, Dave guides the ongoing clinical development and best-practice standards of the clinic.


Bachelor of Psychology (Honours)
Doctorate of Psychology (Clinical)
Diploma of Clinical Hypnosis​

Professional affiliations

City of Port Phillip council’s LGBTQIA+ advisory committee member
Chair of the APS College of Clinical Psychologists Victorian State Committee
Member of the Australian Psychological Society (APS)
Fellow of the APS College of Clinical Psychologists
Member of The Australian Professional Association for Trans Health (AusPATH)

Fees & Hours

Dave works Monday to Friday (Monday and Friday appointments are Telehealth only). The cost of a 50-minute consultation with Dave is $220.00. If referred by a G.P. along with a Mental Health Care Plan, or by a psychiatrist, you will receive a rebate of $129.55 per session via Medicare. Up to 20 Medicare-rebated sessions can be claimed per calendar year. Alternatively, you may wish to claim the consultation fee under private health cover, NDIS, WorkCover, or TAC, if these options are available to you.


Livingston, J. D., Youssef, G. J., StGeorge, J., Wynter, K., Dowse, E. … Macdonald, J. A. (2021). Parental coping and psychopathology during the perinatal period: A mixed studies systematic review and meta-analysis. Clinical Psychology Review, 86.

Pecora, L. A., Hancock, G. I., Hooley, M., Demmer, D. H., Attwood, T., Mesibov, G. B., & Stokes, M. A. (2020). Gender identity, sexual orientation and adverse sexual experiences in autistic females. Molecular autism, 11(1), 1-16.

Demmer, D. H., Puccio, F., Stokes, M. A., McGillivray, J. A., & Hooley, M. (2017). The influence of child gender on the prospective relationships between parenting and child ADHD. Journal of Abnormal Child Psychology. doi:10.1007/s10802-017-0284-7

Demmer, D. H., Hooley, M., Sheen, J., McGillivray, J. A., & Lum, J. A. (2016). Sex differences in the prevalence of oppositional defiant disorder during middle childhood: a meta-analysis. Journal of Abnormal Child Psychology, 1-13. doi: 10.1007/s10802-016-0170-8

Demmer, D. H., Hooley, M., Sheen, J., McGillivray, J. A., & Lum, J. A. (2016). Sex differences in the prevalence of oppositional defiant disorder during middle childhood: A meta-analysis. Paper presented as an oral presentation 22nd International Association for Child & Adolescent Psychiatry and Allied Professions World Congress in Calgary, Canada, 2016, by David Hilton Demmer.