Ratanui Medical has been a group practice in Henderson for over 35 years with a long history of commitment to provide medical care to the community. The practice moved from Ratanui Street to Lincoln Road in 1989 to be in a purpose built building. The three principal doctors are Dr John Caldwell, Dr Chris Wong and Dr Joanna Lang working with other assistant GPs, a GP Registrar and a team of nurses and administration staff.


 
 


Dr John Caldwell
John is committed to general practice, having completed his Fellowship in 2014. He encourages an activity, based lifestyle for healthy living and tries to set a good example by cycling, playing tennis in his spare time.

 
 

 
 


Dr Chris Wong
Chris is a Honorary clinical teacher with the University of Auckland and teaches medical students and GP Registrars.  He has an interest in minor surgery and performs vasectomies.  Chris is a keen tennis player.

 
 

 
 


Dr Joanna Lang
Joanna is originally trained in Poland and has an interest in woman and child health. She is fluent in Polish and likes the performance arts when she is not busy in the garden.

 
 

 
 

Dr Cassie Granek
Cassie is originally from Australia and has now made West Auckland her home. She has two young daughters and enjoys teaching them to appreciate our amazing environment. She works part time and is interested in travel medicine, Maori and Pacific Health.

 
 

 
 

Dr Saville Marquis
Saville is an overseas trained doctor. After becoming registered in NZ, he has worked in Whangarei Hospital and a clinics in West Auckland including Ratanui Medical Centre as a GP Registrar where has returned to Ratanui to work full time. Saville loves sports and in particular cricket.

 
 

 
 


Dr Tilda Samuelson
Tilda trained in Scotland and London and was working in London as a GP prior to moving to New Zealand with her young family. She loves all aspects of GP care.

 
 

 
 

Dr Abigail Smith (Abby)
Abby is from Northland and trained at Auckland Medical School. She works part-time as she has two preschool aged children. She has a particular interest in Women's Health and Paediatrics. Abby shares the practice with Dr Tilda Samuelson.  (On Maternity Leave until approx May 2018)

 
 

 
 
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Dr Michael Wang
Dr Michael is originally from Shanghai, China. He trained at Otago Medical School (NZ) and has recently started a career in General Practice. He is able to speak Mandarin Chinese.  Michael is interested in snow skiing and motorcycles.

 

 
 
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Dr Lauren Brenner
Lauren is an Otago University graduate and recently gained her fellowship in General Practice. Lauren has a background and special interest in women’s health and psychiatry. In her spare time you can find her playing piano, watching movies, cycling, and running after three active children!