I am a CREI-certified fertility specialist and the Medical Director of Genea Sydney CBD, one of Australia's leading fertility clinics. CREI is among the highest subspecialty qualifications available in reproductive medicine in Australia, requiring an additional 3 years of advanced training beyond FRANZCOG, which means my patients benefit from care grounded in deep, focused expertise.
My work focuses on helping individuals and couples from all backgrounds navigate complex fertility challenges from the first consultation through to achieving a healthy pregnancy. I consult Monday to Saturday at Genea Sydney CBD and Genea St Leonards.
Fertility medicine sits at the intersection of science and deeply personal human experience. I have spent my career building both, because I believe my patients deserve both. Each time someone sits across from me in a consultation, I am aware that they have often already been through a great deal – medically, emotionally, and financially. My role is not just to investigate and treat, but to make sure you understand exactly what is happening, what the evidence says, and what your real options are. I explain the science clearly and directly because you deserve to understand what is happening in your own body.
Every consultation is a judgement-free space. I see individuals and couples from all walks of life – heterosexual couples, same-sex couples, single women, and people facing complex medical circumstances like cancer diagnosis. No matter your situation, I am here to help you understand your options and move forward with clarity.
"Understanding the emotional journey my patients face is as important to me as the clinical picture. Every consultation is a judgement-free space where we look at the full picture together and work out the best path forward."
I hold a medical degree from the University of Newcastle, where I was awarded the Faculty of Medicine Medal – recognising academic excellence throughout the B. Medicine program. I then completed a Master of Medicine in Reproductive Health and Human Genetics at the University of Sydney, which informs my deep interest in genetic testing of embryos and the science of hereditary conditions.
My training in Obstetrics and Gynaecology took place at Sydney’s Royal Prince Alfred Hospital. I am a Fellow of the Royal Australian and New Zealand College of Obstetricians and Gynaecologists (FRANZCOG). As a certified subspecialist in reproductive endocrinology and infertility (CREI), I completed an additional three years of advanced training in fertility care beyond FRANZCOG – a qualification held by a relatively small number of specialists in Australia.
I am the Medical Director at Genea Sydney CBD, located at Suite 3, Level 3, 321 Kent Street, Sydney. I also consult at Genea St Leonards, located at Suite 3, Level 3, 205 Pacific Highway, St Leonards. Both rooms are available Monday to Saturday for consultations – in person and via telehealth.
Genea is one of Australia’s world-leading fertility providers, with decades of research and development behind its clinical programmes. As Medical Director of the Sydney CBD clinic, I am closely involved in the quality of care we deliver and the technology we use.
My decision to partner with Genea to provide fertility services was grounded in their commitment to research and development. Genea’s investment in proprietary technology and consistently strong outcomes are what drew me to the organisation Genea Fertility, and it continues to shape how I practise.
Learn more about Genea’s services and success rates
If you have been through fertility treatment that has not worked, or if you feel that your situation has not been fully investigated, a second opinion may be one of the most valuable things you do. I welcome these consultations and approach them without judgement toward your previous care team. I review all your previous investigation and treatment records before we meet, so our time together is spent on substance – what might have been missed, what options remain unexplored, and what the evidence says about your specific situation.
To make the most of a second opinion consultation, bring all previous test results, monitoring reports, and embryology records. The more information I have before we meet, the more useful our conversation will be.
I’m committed to providing the highest quality care, uniquely tailored to meet your personal health needs and fertility journey. With a comprehensive range of fertility treatments and preservation options, my goal is to support individuals and couples from diverse backgrounds, medical histories, and genetic profiles. No matter where you are on your journey, I offer holistic, expert care that aligns with and supports your family-building goals.
I hold a medical degree from the University of Newcastle, where I was awarded the Faculty of Medicine Medal, recognising academic excellence throughout the B. Medicine program.
I then completed a Master of Medicine in Reproductive Health and Human Genetics at the University of Sydney. My training in Obstetrics and Gynaecology took place at Royal Prince Alfred Hospital, and I am a Fellow of the Royal Australian and New Zealand College of Obstetricians and Gynaecologists.
As a certified subspecialist in reproductive endocrinology and infertility (CREI), I completed an additional three years of advanced training in fertility care.
CREI stands for Certified Reproductive Endocrinologist and Infertility Subspecialist. It is the highest level of postgraduate training in fertility medicine in Australia, requiring an additional three years of advanced training beyond FRANZCOG. It means the specialist you are seeing has extensive expertise in the most complex areas of fertility care, not just general obstetrics and gynaecology.
Yes, I see individuals and couples from all backgrounds and family structures, including single women, same-sex couples, and people using donor sperm or eggs. Everyone deserves access to evidence-based fertility care, and I aim to make that a reality for all my patients.
Yes, and I actively welcome second opinion consultations. If you have had unsuccessful treatment cycles or feel your situation has not been fully investigated, a fresh perspective can make a real difference.
I consult Monday to Saturday at Genea Sydney CBD and Genea St Leonards. Both in-person and telehealth consultations are available. Call 1300 330 990 or visit the contact page at anthonymarren.com.au/contact-us/ to book.
Male infertility accounts for 30-50 percent of all cases in couples who are having difficulty conceiving. Despite this, it is frequently under-investigated. When I see a couple, I always assess both partners from the outset - because investigating only the female side while a significant male factor is present wastes time and delays the right treatment. I request a sperm DNA fragmentation test routinely, and where the semen analysis is abnormal, I pursue a thorough hormonal and genetic workup. Male infertility is not a footnote in fertility medicine. It deserves the same precision and care as any other cause.
Preimplantation genetic testing is a procedure performed during IVF that allows embryos to be assessed for chromosomal abnormalities or specific genetic conditions before transfer. I have a particular interest in PGT-A, PGT-M, and PGT-SR, and completed a Master of Medicine in Reproductive Health and Human Genetics at the University of Sydney. PGT can help improve implantation rates, reduce miscarriage risk, and give patients important information about their embryos. Learn more about preimplanation genetic testing here.
A cancer diagnosis should never cost someone their future family options if preservation is possible. For patients who are about to begin chemotherapy or other treatments that may affect fertility, I provide fast-access consultations to discuss egg freezing, sperm freezing, and embryo banking. This is an area I care about deeply.
