Our Team - Sydney Bariatric Clinic

Our Medical Staff

Dr Brendan Ryan


Dr Ryan is a bariatric surgeon with over 15 years of experience in the field of obesity surgery. He has performed over 5000 weight loss operations. He specialises in Gastric Sleeve, Gastric Bypass and Revisional Bariatric surgery. He also has an interest in Anti-reflux, Hiatal Hernia and Gallbladder surgery.

Dr Ryan has rooms in Westmead and Campbelltown and operates privately at Westmead Private, Lakeview Private and Campbelltown Private Hospitals.

He has public appointments at Westmead and Blacktown Hospitals.

Dr Ryan has been awarded Surgeon of Excellence in Bariatric and Metabolic Surgery. Sydney Bariatric Clinic has proudly been recognized as a International Centre of Excellence in Bariatric Surgery also.

Dr Ryan contributes to the National Bariatric Registry and is part of the Research team of Sydney Bariatric Clinic which presents regularly at National and International Bariatric Meetings. He is committed to maintaining best practices in weight loss surgery.

See more

Dr Carolyn Jameson


Dr Carolyn Jameson is a highly skilled bariatric surgeon with over 10 years of experience in obesity surgery. She specialises in gastric sleeve, gastric bypass and revision bariatric surgery as well as endoscopic procedures. Dr Jameson believes in an empathic, holistic and multidisciplinary approach to patient care. Patient safety and quality outcomes are the principles by which she conducts her practice.

She has been accredited as a Surgeon of Excellence in Bariatric and Metabolic Surgery. Dr Jameson contributes to the National Bariatric Registry. She is the head researcher of Sydney Bariatric Clinic which presents regularly at national and international bariatric meetings.

Dr Jameson is a member of the Clinical Review Committee at Westmead Private Hospital and the RACS Clinical Examinations Committee. She is a specialist general surgeon and the supervisor of specialist general surgical training at Auburn Hospital. Dr Jameson is a senior lecturer in surgery at the University of Notre Dame.
Dr Jameson has rooms at Westmead and Penrith and operates at Westmead Private Hospital.

See more

Dr John Leyden

Anaesthesia and Perioperative Clinic

Dr John Leyden is Sydney Bariatric Clinic’s lead anaesthetist with over 15 years of experience in providing comprehensive and tailored perioperative and anaesthetic care for all patients undergoing metabolic/bariatric surgery. Additionally, Dr Leyden has 20 years of experience in cardiothoracic anaesthesia. His expertise means Sydney Bariatric Clinic can safely care for even the most medically complex patients.
Dr Leyden completed a clinical fellowship in Cardiac Anaesthesia at the University of Toronto, Canada, St Michael’s Hospital campus. He is the founder and chairman of NeuroEndocrine Cancer Australia (formerly known as the Unicorn Foundation), a not-for-profit charity for patients with rare neuroendocrine cancers.
Dr Leyden is passionate about providing tailored anaesthesia care for each of his patients. He creates recovery programs that ensure all patients receive the highest level of care at SBC’s pre-operative clinic.

See more

Dr Tony Brancatisano

Obesity and Metabolic Clinic/Practitioners

Dr Tony Brancatisano is a senior bariatric medical practitioner, research scientist and surgical assistant in bariatric surgery. He has over 15 years of experience in weight loss management. This includes the pre-operative assessment, post-operative and long term management of patients with obesity undergoing gastric banding, sleeve gastrectomy, gastric bypass operations and revisional bariatric procedures. He is a medical graduate of the University of Sydney.
Dr Tony is part of the allied health team involving dietitians, psychologists and exercise consultants. The allied health team provides guidance and support throughout every patient’s weight loss journey. Dr Tony is dedicated to achieving the best outcome for every patient through his personalised and comprehensive approach. He understands that obesity is a complex chronic disease and that bariatric surgery requires lifelong follow up and care; a partnership between the patient, the clinic, and the patient’s regular GP.
Dr Tony consults regularly at Westmead Private and Campbelltown.

See more

Catherine Underwood


Catherine is an accredited practising dietitian and nutritionist with extensive experience supporting patients with their weight loss and health goals post-bariatric surgery. Catherine supports you to pass smoothly through the stages of dietary progression after weight loss surgery. She also serves as a valuable support to ensure sustained weight loss in the long term, no matter what hurdles life throws in your direction. Catherine will work with you to implement healthy eating behaviours that fit your lifestyle. This work will also focus on the psychology behind the food you eat.

Catherine is extremely knowledgeable and passionate about diet and nutrition. She finds working with patients extremely rewarding and loves being part of the process that sees patients achieving life-changing results.

Catherine is based at SBC’s Westmead clinic.

See more

Tania Chaanine


Tania is an accredited practicing dietitian and accredited nutritionist specialising in the management of obesity. She completed her Bachelor of Science and Honours in Nutrition and Dietetics at the University of Sydney. Additionally, Tania is a member of the Dietitians Association of Australia and a FODMAP certified dietitian.
Tania has been working in the area of weight loss surgery for over 10 years alongside leading bariatric surgeons in Sydney. She is dedicated to delivering the highest level of care by providing an individualised evidence-based approach. Tania looks forward to working with you to help you achieve the best outcome possible.
Tania is based at SBC’s Westmead and Campbelltown clinics.

See more

Dr Cal Paterson

Clinical Psychologist

With over a decade of experience in bariatric psychology, Cal has worked with patients of all ages across a diversity of backgrounds, in both surgical and non-surgical care teams. Cal works with patients at an individual level to untie the knots of confusion and guilt around self-care. Cal believes a tailored approach is important. Cal works around the notion that every body, every person’s life is unique to them, and so each person needs to find their own unique pathway to health.

Cal is based at SBC’s Westmead clinic.

See more

Phoebe Johnson


Phoebe Johnson is a registered psychologist who has worked with adults and young people in a variety of public and private mental health settings, including hospitals, universities and in private practice. She is particularly interested in pre- and post-operative adjustment to bariatric surgery and the psychology of eating, and also has experience working with people experiencing mood and anxiety issues, problems with substance use, and identity and self-esteem concerns. Phoebe uses a trauma-informed approach and provides an open, non-judgemental space to explore your concerns, shift unhelpful patterns and work towards what matters most to you. 

See more

Sean Mungovan


Associate Professor Sean Mungovan is Sydney Bariatric Clinic’s head physiotherapist with over 25 years of experience in the prescription of exercise for optimal health and wellbeing. He is the Director of Allied Health at St Vincent’s Private Hospital, Sydney and the Director of the Clinical Research Institute, Westmead.
Sean leads a diverse and talented team of physiotherapists who work closely with each patient through each stage of their weight loss journey. The physiotherapy team works in conjunction with all members of SBC’s team, assessing each patient prior to surgery and prescribing individualised exercise programs to maximise recovery. Our physiotherapy team is experienced with both hospital-based care and post-hospital discharge to prescribe exercise programs to allow patients to safely achieve their individual goals. Sean and his team look forward to working with you.
Sean and his team are based at SBC’s Westmead clinic.

See more

Daniela Pacuka

Exercise Physiologist

Daniela has more than 8 years of experience as an accredited exercise physiologist. Daniela’s role within the team at SBC is to help track patient’s progress, provide education and provide custom exercise prescription based interventions to help facilitate a patients weight loss journey as a part of post-operative care. She holds a Masters in Clinical Exercise Physiology and two Bachelor’s degrees in Sport and Exercise Science and PDHPE.

Daniela has extensive experience working in private practice. She specialises in musculoskeletal injuries, chronic conditions and metabolic conditions. Daniela has the knowledge and skills to assist patients with weight loss and chronic conditions. She finds the most rewarding part of working in the bariatric field is seeing the positive change in patients after their surgery.

Daniela is based at Anytime Fitness in Campbelltown and Narellan.

See more

Shannon Morley

Exercise Physiologist

Shannon is an Accredited Exercise Physiologist who works within the private practice Health Focus Clinic servicing the Macarthur and South West Sydney region. She has a passion for helping people become better versions of themselves and encouraging patients to see their full potential. Exercise really is medicine! I take the time to get to know each patient individually before designing a structured exercise routine that is going to optimise the patient’s weight loss goals and make them feel comfortable in their skin. 

See more

Claire van Wyk

Practice Nurse

Claire is our practice nurse who supports all the patients through their weight-loss journey. She works closely with Dr Ryan and Dr Jameson to answer any medical or nursing queries or concerns you might have at any stage of the program.

You will meet Claire at the pre-operative clinic if you decide to go ahead with surgery and she will provide information about all aspects of the process, the surgery, the recovery and after care. She will also see you regularly after surgery both in the hospital and later in the rooms.

Her goal is to ensure all patients receive all the necessary medical attention they deserve when going through this life-changing treatment.

See more

Our Support Team


Admissions and Finance Specialist

See more

Sarah Robertson

Patient Liaison Specialist

See more

Morgan Cramp

Finance and Administration Specialist

See more