Dr. Jon Armstrong

General Surgeon


Mr Armstrong is a UK and Australian trained Bariatric, General and Endocrine Surgeon and is the founder and director of Advance Surgical, Nedlands est. 2013.
Obtaining his fellowship of the Royal Australasian College of Surgeons in 2002.
Mr Armstrong has performed over 3000 bariatric procedures and over 2000 sleeve gastrectomies.
He has published results from his series and has presented these results at several international meetings. Mr Armstrong also performs Endocrine Surgery and General Surgery (except Breast and Colorectal surgery).

Mr Armstrong has worked as a consultant surgeon since 2002 and operates at
St. John of God Hospital Subiaco and
Hollywood Private Hospital.

Patient consultation sessions at
– Hollywood Medical Centre, Nedlands.
– St John of God, Carine Specialist Centre.
– Rockingham Specialist Centre.

Dr Jon Armstrong is a fellow and member of the following :

    • Royal Australasian College of Surgeons (FRACS)
    • International Federation for the Surgery of Obesity and Metabolic Disorders (IFSO)
    • Obesity Surgery Society of Australia and New Zealand (OSSANZ)
    • International Association of Endocrine Surgeons (IAES) International Surgical Society (ISS)
    • Australian and New Zealand Endocrine Surgeons (ANZES)
  • West Australian Endocrine Surgeons (WAES)

Mr. Siva Gounder

General Surgeon

Siva obtained his Medical Degree in 1999 -Kasturba Medical College in India.
Siva is originally from Malaysia and has made Perth home since 2007.

He completed his postgraduate training in General Surgery at University of Malaya and also obtained membership with the Royal College of Surgeons (Edinburgh).He migrated to Perth and underwent further specialized advanced surgical training in all major Perth hospitals through the Surgical training program of the Royal Australasian College of Surgeons. He successfully obtained the Fellowship of the Royal Australasian College of Surgeons (FRACS) in 2015.

He was subsequently selected for a Bariatric Surgery fellowship in North Shore Hospital, Auckland which he successfully completed in 2016. This is an OSSANZ accredited bariatric surgery training position. He has trained to deal with obesity and all related problems and performs gastric banding, sleeve gastrectomy, gastric bypass, duodenal switch operation. He is also a GESA accredited endoscopist and performs gastroscopy and colonoscopies.

Public Appointments:

    • Consultant Surgeon
  • Senior Lecturer University of Notre Dame

Private hospital consulting:

  • Hollywood Private Hospital, Nedlands

Professional memberships:

    • Fellow of Royal Australasian College of Surgeons
    • Member of Royal College of Surgeons Edinburgh
    • Obesity Surgery Society of Australia and New Zealand (OSSANZ)
  • International Federation for the Surgery of Obesity and Metabolic Disorders (IFSO)


Practice Manager

Nadia assisted in the start up of Advance Surgical in 2013 and has been an integral part of the Advance Surgical team since.

Qualified as a Medical Imaging Technologist 2003 (specialising in MRI), this previous background of working in the medical field has given her the ability to align easily into the role of Practice Management.

As a qualified MIT ( Medical Imaging Technologist/ Radiographer) and DEXA Operator – she is able to perform DEXA scans and inform you of Body Composition results.

Nadia is involved in the smooth running of the practice and assisting in clinics, arranging theatre lists/bookings and helping with superannuation applications.  She is able to provide you with information on any consultation with Advance Surgical and looking forward to being of assistance to you.

Sarah Flanagan


BSC, Grad Dip (Dietetics), MDAA, APD, AN

Sarah Flanagan divides her time between her private practice and being a mother of two busy children. Born and raised in Perth, Sarah went on to study Dietetics at Curtin University before working in the Goldfields and South East Coastal region of WA. It was there that she met her husband David and decided to travel and work overseas. Sarah gained a broad range of dietetic experience working as a Dietitian overseas (London, Guernsey and Ghana).

Then returning to Western Australia, working at a number of Perth hospitals before taking on the role of Public Health Dietitian at The National Heart Foundation of Australia where she worked for over 2 years.

In 2004 and after having her 2 children, Sarah started her own private practice. For over 10 years, Sarah has been working predominantly in the field of bariatric (weight loss) surgery. In addition to this, Sarah provides on-going mentorship for Dietitians and has worked with Edith Cowan University as a Clinical Supervisor. Sarah is a Patron for the Charity, Kalparrin, and devotes a lot of her spare time promoting the importance of supporting families of children with special needs and disabilities.

Anne Marie Stanley


BSc, Grad Dip (Dietetics), APD, AN

Anne Marie has been a Dietitian for 23 years since graduating from Curtin University. She has been dedicated to private practice throughout most of these years however; she also has experience working in public and private hospitals, with Diabetes WA and on community based projects. Anne Marie has a special interest in aged care having worked in both restorative and residential care settings.

She has extensive experience as a Dietitian consulting with individuals undergoing Bariatric surgery, being one of the first dietitians in Perth to undertake this role. She has been a keen advocate of the multidisciplinary approach to weight management surgery and has also been involved in research related to the effectiveness, long term outcomes and health impact of these surgeries.

Anne Marie recently returned to Perth after living in Singapore for a few years with her family. She enjoyed sharing the cultural experience of living in a foreign country with her children and is grateful to have been able to contribute some of her time there as a volunteer for Habitat for Humanity and Ronald McDonald House. Supporting families with critically ill children at Ronald McDonald House and working side by side with families to build their first homes in Malaysia and Indonesia, are experiences she will remember forever. Volunteering has become a passion that she and her family now share and have continued since arriving back in Australia.

Margaret Hays


Bsc (Nutrition), Grad Dip (Dietetics), Grad Dip (Diabetes Education)

Margaret has been a Dietitian for 28 years and currently works in Private Practice seeing clients one on one in Corporate Health. Margaret also works in Indigenous remote communities with Chronic Disease Specialist Teams and has worked as both a Community Nutritionist and a Dietitian in the Food Industry both here and overseas.

Preventative Health is one of Margaret’s passions, so working with clients to lower their risk of Chronic Disease is a high priority for her. She also works with people that already have Diabates, Heart Disease, Weight Issues and other Health Conditions to improve their health through better food and nutrition choices. She is able to help clients make lasting changes to their food and lifestyle habits in a manner that is helpful, supportive, practical and friendly.

As a Senior Media Spokesperson for the Dietitians Association of Australia, Margaret is often called upon to provide both Diet and Nutrition related comments for National TV, Newspaper and Radio.

Carol Rolston

Clinical Psychologist

BS, MP (Psychology), Dip (Hypnotheraphy)

Carol Rolston is a Clinical Psychologist who has spent the last decade of her career specializing in the provision of psychological therapies to help overweight and obese adults lose weight, and maintain their weight losses. For the last five years, Carol’s focus has been on the care and support of bariatric surgery patients, helping them achieve the behavioural, psychological and lifestyle changes necessary to ensure the best possible weight loss and quality of life outcomes from surgery.

Overweight and obesity are complex conditions, resulting from a combination of biological, psychological and social factors unique to the individual. Successful treatment involves understanding how these factors have combined to cause problems for each individual. Carol specifically targets these factors in psychotherapy, ensuring they no longer pose obstacles to an individual achieving an optimal treatment outcome.

Carol holds a Bachelor of Science degree (with Distinction), and a Bachelor of Science degree in Psychology with First Class Honours from Curtin University, a Master of Psychology degree (Clinical) from the University of Western Australia and a Diploma in Clinical Hypnotherapy. She is registered with the Australian Health Practitioner Regulation Agency and Psychology Board of Australia as a Clinical Psychologist and is a member of the Australian Psychological Society, the Obesity Surgery Society of Australia and New Zealand (OSSANZ), the Australian and New Zealand Obesity Society (ANZOS) and APS Psychology of Eating, Weight and Body Image Interest Group. Carol is registered both as a Medicare and Private Health Care service provider.

In addition to therapeutic interventions for weight management, Carol also provides treatment for a broad range of psychological issues including mood, anxiety and eating disorders, and psychological difficulties secondary to medical conditions such as irritable bowel syndrome. She is committed to providing outstanding care matched to the specific needs of her clients, within a supportive, respectful environment.

Kirstie Potter


For several years Kirstie set up and ran the private practice of four surgeons who each specialised in a different medical field, before emigrating to Perth.  She has worked in the medical sector for over 10 years and she previously worked as a PA in London. 

Kirstie is exceedingly competent and knowledgeable, and she can help you with all aspects of our practice.  She is responsible for overseeing the services provided to you from your initial telephone enquiry, until you are discharged from the care of your Surgeon.

She is bubbly and compassionate; a real asset to our team.

Steve Verster

Exercise Physiologist MSc (AEP)

Steve has been an accredited exercise physiologist for the past 8 years, providing a range of exercise modalities to treat a variety of chronic conditions including obesity, cancer, and musculoskeletal injuries.

He has worked with a range of population types, including professional athletes to war veterans. 

He holds a Bachelor degree in Exercise Physiology, with Masters degree in both strength and conditioning, and research design, and is currently completing a PhD in genetics and physical performance.

Steve currently runs the DEXA machine for Advance Surgical.

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Contact Advance Surgical


Hollywood Medical Centre Suite 8, 85 Monash Avenue Nedlands WA 6009 (Perth)


+61 8 9386 2634


+61 8 9386 2167


Monday - Friday: 9am - 5pm