Get to know the Letitia Street Clinic Doctors

Dr. Ashley Berry

MBBS, Grad Dip (Nutrition)

Dr Berry Graduated from the University of NSW in 1979.  His major interest is nutritional / complementary medicine. He believes that most chronic illnesses can be improved through a nutritional focus: CFS, fibromyalgia, cancer prevention and treatment, diabetes, heart disease, insulin resistance, IBS and hormonal problems.

Dr Berry is a Part time medical student tutor at St George Hospital, the University of NSW, and a casual teacher for ACMN: Australasian College of Medical Nutrition, Melbourne

Dr Berry Consults Monday, Tuesday and Wednesdays

Dr Reinier De Villiers

De Villiers graduated from the University of Pretoria, South Africa in 1987.  His major interests are Ear, Nose and Throat, Orthopedic(Sport Medicine) and Obstetrics. He is a broad based generalist with extensive experience in General Practice.

Dr De Villiers moved to Australia in 2008 and attained full Australian Specialist Family Physician registration in 2012. He worked as a GP Proceduralist until 2015 in Narrogin, WA with 20 years of experience in Intra Partum Obstetrics, Anaesthetics and and Emergency Department.

He joined Letitia Street Clinic in September 2017 and consults Tuesday to Saturday.

Dr. Jennifer Davis


Jennifer graduated from the University of Sydney in 1978.  She earned a Diploma of Anaesthetics in the UK and a Diploma of the Royal Australian College of Obstetricians and Gynaecologists locally.  She has extensive experience in Paediatrics.

After working in the UK and rural NSW, each for several years, she returned to Sydney and set up practice in the Menai area.  After 29 years there she moved to Oatley for a ‘sea change’.

Dr. Dennis Koutis


Dr Koutis Graduated from Sydney University in 1987. He has a Diploma in Clinical Epidemiology.  Dr Koutis previously worked for several years in Sydney teaching hospitals,including 2 years at Royal Prince Alfred Hospital. He has  worked in the country, as a GP in Singleton and as a resident medical officer at Orange Base Hospital.   Dr Koutis has also worked as Medical Officer in Community Paediatrics for the Canterbury Community Health Service.  He has worked in Oatley since 1993 and has many years of experience in all aspects of General Practice.

Dr. Thalia Tung


Dr Tung joined Letitia Street Clinic in Sept 2018, She currently consults Monday to Friday. Dr Tung has an interest in Skin Cancer Medicine and Aesthetic medicine. Dr Tung enjoys women and children’s health and is trained for IUD and Mirena insertion. As part of her Aesthetic medicine interests, Dr Tung provides anti wrinkle, dermal filler injections, microneedling and skin PRP injections for skin rejuvenation.

Information on the aesthetic services offered by Dr Tung can be found at

Dr. Donald Vas


Graduated Physiological Sciences ( Oxford Uni,1977), Medicine (London Uni, 1980). Dr Vas has over 25 years experience in General Practice. He has a special interest in the diagnosis and removal of skin cancers and holds a Post Graduate Certificate in Skin Cancer.

Dr. Anita Wong


Dr Wong Graduated Sydney University 1st Class Honours in 1997. She has Fellowship of the Royal Australian College of General Practitioners . Certificate in Sexual and Reproductive Health , Diploma of Obstetrics and Gynaecology, Diploma of Child Health .  Dr Wong is committed to complete family medicine and preventative care with a special interest in womens’ health , sexual and reproductive health and paediatrics . Dr Wong also has an interest in skin and provides skin rejuventation treatments through dermal fillers and anti wrinkle injections.

Dr, Leonie Yen


Dr Yen Graduated from Uni of Adelaide in 1987 with the John Cleland medal for Pathology.   She enjoys all aspects of general practice with a special interest in paediatrics , women’s health & acupuncture. Dr Yen has completed an acupuncture course in 1989 & a diploma of child health from Uni of Sydney in 1998. Dr Yen enjoys teaching as a supervisor & examiner for medical students & new doctors.