Dr Hugh Allen

Respiratory, Sleep and General Paediatrician

Dr Allen is a respiratory and sleep physician. He also does general paediatrics and allergy management. He offers services such as allergy testing and pulmonary lung function test.He works with the paediatric sleep study units at Sydney Adventist Hospital and Sydney Children's hospital,Randwick for performing paediatric sleep studies. Both these Sleep Centres now offer a full range of diagnostic and therapeutic intervention sleep studies for children.

Dr Hugh Allen graduated from the University of Sydney in 1979 and completed his fellowship in 1985 . He has been a fully qualified paediatric sleep physician since 1987 through the Royal Australasian College of Physicians. He has worked both in rural and outback NSW. He is currently a Visiting Medical officer at the Royal North Shore Hospital and has worked there for the last 25 years.



Dr James Thomas

General Paediatrician

Bsc(Med), MBBS, FRACP, GradDipClinEpi

Dr Thomas is a consultant general paediatrician, practicing in this role since 2005, having completed his training at the Children’s Hospital at Westmead. He has VMO positions at Royal North Shore Hospital and Sydney Children’s Hospital.

In his practice, Dr Thomas sees children from newborn to 18 years of age. While he sees a broad range of general paediatric issues, he has a special interest in developmental delays and disorders, behavioural difficulties, learning difficulties, attentional disorders / ADHD, problems with growth, weight gain and nutrition, toileting issues, and bowel/ bladder problems. He will work closely with parents, school staff, psychologists and other allied health professionals to achieve the best outcomes for the children he sees. Dr Thomas previously worked in private suites at Artarmon.



Dr Karin Timmers

General Paediatrician 


Dr Karin Timmers is a Consultant Paediatrician with abundant experience in acute and on-going general paediatric care. In addition, she has experience in Adolescent Health including management of eating disorders, weight management and complex adolescent care.

Karin gained her Medical Degree (MBBS/MSc) in the Netherlands and moved to Australia in 2005, where she completed her Paediatric training, including a Masters of Public Health at the University of Newcastle.

Karin worked in Tertiary Paediatric Centres such as Sydney Children’s Hospital in Randwick, The Children’s Hospital in Westmead, John Hunter Children’s Hospital and several regional and rural hospitals.

Karin provides General Paediatric and Adolescent Care including direction and support to children and families that are struggling with eating disorders and weight management.

As a mother of a boy and a girl in primary school, Karin is aware of the impact medical and mental health issues have on the individual and their family, and is passionate in providing support for families in need.

Karin is a Fellow of the Royal Australasian College of Physicians (RACP), a member of the Australian and New Zealand Association of Eating Disorders (ANZEAD), a member of the Australian Association of Adolescent Health (AAAH) and a member of the Neurodevelopmental and Behavioural Paediatric Society of Australasia (NBPSA).


Dr Rifat Chaudry

Respiratory, Sleep and General Paediatrician

MBChB (Glasgow), MRCPCH, MD (Imperial College London), FRACP

Dr Chaudry is a UK trained Specialist in Paediatric Respiratory and Sleep Medicine. Before moving to Sydney in 2015 with her growing family, she was working as a full time Consultant at the Royal London Hospital.

Since arriving in Sydney, Rifat has worked at Sydney Children’s Hospital and John Hunter Children’s Hospital in the Respiratory departments, between periods of maternity leave.

Dr Chaudry has 18 years’ experience in tertiary and quaternary Respiratory medicine, having completed training in Glasgow and across London at leading children’s specialist hospitals: Royal Hospital for Sick Children in Glasgow, Royal Brompton Hospital in London (The National Heart and Lung institute) and Great Ormond Street Children’s Hospital in London. Areas of interest include childhood asthma, recurrent bronchiolitis, viral induced wheeze, chronic wet cough, noisy breathing, cystic fibrosis, congenital lung abnormalities, allergic rhinitis and sleep disordered breathing.

Dr Chaudry is happy to see children with a wide range of clinical issues and has a greater level of empathy and understanding since becoming a parent herself. A holistic approach is central to her clinical management, with the child’s individual needs kept paramount when considering the provision of practical and sustainable medical care.  



Dr Alexandra Johnson

Paediatric Neurologist

Dr Alexandra Johnson is a Paediatric Neurologist working in both the public and private sectors in Sydney, Australia. She has positions at Sydney Children’s Hospital, Royal North Shore Hospital and Liverpool Hospital and privately, consults in St Leonards (Northern Children’s Specialist Clinic) and Bondi (The Children’s Clinic). She also loves spending time with her husband and two children, who try to help her become an expert in Minecraft, Star Wars, and Transformers (currently).

Neurological disorders such as headache and epilepsy are not uncommon in children, teenagers and young adults. At least five out of every ten teenagers experience headache at least once a month. One in twenty children will have a seizure during childhood, whilst one in two hundred are diagnosed with epilepsy. Both disorders .can lead to a high burden of disability and distress or anxiety for these children and their families. In walking this path with families, Alexandra aims to understand their concerns through listening, communication and provision of appropriate information and education.

Dr Johnson provides Neurophysiological Investigations (EEG) through Northern Neurophysiology which is located at the North Shore Private Hospital. Please ring 0294379288 to make an appointment or fax the referral to 0294379277. Please click the link below.

Neurophysiology (EEG) referral form



Dr Simone Ardern-Holmes

Paediatric Neurologist

Dr Simone Ardern-Holmes has worked in the field of paediatric neurology and neurogenetics. At present she is associated with the Children's Hospital, Westmead.



Dr Kim Ramjan


Paediatric Endocrinologist

Dr Kim Ramjan is a Paediatric Endocrinologist and Staff Specialist at the Royal North Shore and Gosford Hospitals (Type 1 diabetes clinic). She completed a BSc and MBChB at the University of Otago, Dunedin, New Zealand and a Diploma of Child Health during her paediatric training. 

Kim trained in paediatric endocrinology at the Institute of Endocrinology and Diabetes at The Children’s Hospital at Westmead. She has clinical interests in obesity and insulin resistance, puberty, growth and thyroid disorders in children and adolescents.

Kim is completing a PhD through the University of Sydney investigating the effect of a novel form of resistance training in the management of overweight adolescents with insulin resistance. She continues to be involved in mentorship and training of medical students and junior doctors as a Clinical Associate Lecturer at the Sydney Medical School.



Dr Guy Henry

Paediatric Surgeon


Dr Guy Henry is a specialist Paediatric Surgeon who has been practicing in Sydney for over 10 years. He is based at Sydney Children's Hospital in Randwick, and also consults and operates in the Sutherland Shire and on the lower North Shore.

His interests include general paediatric surgery (including circumcision), hypospadias, minimally invasive surgery (keyhole surgery), gastroesophageal reflux surgery, oncological surgery and foetal malformations.

For Appointments and Enquiries, please contact his secretary Hazel.

Phone: 02 9650 4422

Website: http://www.drguyhenry.com.au/




Dr Kunal Thacker

Paediatric Gastroenterologist


Dr Thacker is a pediatric gastroenterologist and hepatologist commencing private consultation and endoscopy service for children.  He completed his training in gastroenterology and hepatology from the Children’s Hospital Westmead, followed by Sickkids Hospital (Toronto, Canada). After working in Perth at Princess Margaret Hospital for Children (now Perth Children’s Hospital) for 5 years, he has now moved to Sydney and  has recently joined the Children’s Hospital Westmead as a staff specialist. 

Dr Thacker will be providing consultations at our practice and will be performing endoscopy procedures at Westmead Private Hospital and Norwest Private Hospital. He will also be providing consultations from Bella Vista and Liverpool. To learn more about his practice, please visit his website or contact his secretary Jessica.

Phone : 1300742787

Fax for Referrals: 0290120030

Website: www.sydneypaediatricgastro.com.au




Nisha Thacker


Nisha completed her Masters of Nutrition and Dietetics at Griffith University, Gold Coast. She has observed various dietetic set ups at tertiary hospitals in Sydney & Toronto, to get a global perspective in dietetics. She started her career at Royal Prince Alfred Hospital-Allergy Unit, Sydney in 2012, where she developed an interest & built her skills in the area of Food Allergy & Intolerances in paediatric & adult population. Additionally, Nisha has been providing private consultation service for various clinical conditions, in Perth (Western Australia) since 2014. She has worked in a specialist (Gastroenterology) private clinic, GP center, community setting & in an acute care setting (hospital). Recently, she has moved with her family to Sydney for good. Nisha believes through the experience gained in different dietetic settings, she is skilled to provide individualised & evidenced based dietetic interventions. She is keen to continue her dietetic career in Sydney and is commencing private consultations at Northern Children Specialist Clinic (St Leonards) and Castle Hill Medical Centre. She is a member of Dietitians Association of Australia. Nisha loves playing badminton & enjoys dancing, arts, crafts, & experimenting with new flavours. 









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