Meet the
ace specialists

Our experienced specialists come from a diverse range of backgrounds, represent a variety of specialties and share a common objective to provide excellent specialist care.

Dr Michael Tjeuw

Dr Michael Tjeuw

Consultant Rheumatologist

Available at: Wahroonga & Tamworth

Dr Tjeuw is founder and owner of ace specialists. He studied medicine at the University of New South Wales and has trained across a number of major tertiary teaching hospitals in Sydney before commencing his training with the Royal Australian College of Physicians. He undertook specialty training in Rheumatology at Royal Newcastle Centre, The Prince of Wales and Royal Prince Alfred Hospitals.

Upon gaining his fellowship to the RACP, Dr Tjeuw has been committed to providing the highest level of Rheumatological care in the private sector. Dr Tjeuw provides a clinical service to inpatients at Sydney Adventist Hospital, affectionately known as the The San. Dr Tjeuw is committed to providing specialist access in regional and rural NSW, and so visits Tamworth. Dr Tjeuw enjoys the diagnostic challenges and the systemic nature of rheumatology.

Dr Tjeuw is passionate about medical education. He completed a Graduate Certificate in Health Professionals Education through Monash University in 2013. He has a Clinical Lecturer appointment with the University of Sydney and hopes to continue to be involved with medical student and doctor in training medical education.

Special interests include:

  • Early management of inflammatory arthritis
  • Pulmonary hypertension

Dr Tjeuw sees himself as a clinician who provides the highest level of evidence based comprehensive care whilst being practical and down to earth.

Image of Dr Carmella Gunasingham

Dr Carmella Gunasingam

Consultant Rheumatologist

Available at: Wahroonga

Dr Carmella Gunasingam is a Rheumatologist dedicated to providing thorough, evidence-based, patient-centered care.

Dr Gunasingam completed her Bachelor of Medicine at the University of Newcastle and also obtained a Master in Public Health from the University of Sydney. She completed her internship, residency and physician training at Royal Prince Alfred Hospital. She continued to complete her specialty training in Rheumatology at Royal Newcastle Centre, Royal Prince Alfred Hospital and Westmead Hospital and successfully gained fellowship to the Royal Australasian College of Physicians.

Dr Gunasingam has been actively involved in medical education and mentorship throughout her career. She also has interests in clinical research and has presented at national and international Rheumatology meetings. She is committed to professional development and is a member of the Australian Rheumatology Association.

Dr Gunasingam is interested in all facets of rheumatology, with particular interests in inflammatory arthritis, connective tissue disease, vasculitis and osteoporosis.



Dr Sunny Randhawa

Hip, Knee and Trauma Surgeon

Available at: Wahroonga

Dr Sunny Randhawa is an Australian trained orthopaedic surgeon providing surgery and treatment of the hip and knee.

Dr Sunny Randhawa grew up in Canberra, where he completed his Higher School Certificate. He was then awarded a seat to study medicine at the prestigious Royal College of Surgeons in Dublin, Ireland, after which he returned to his native Canberra to commence his junior medical career.

On moving to Sydney, Dr Randhawa was selected to participate in the NSW orthopaedic training scheme where he undertook rotations in Newcastle, Gosford and the rural posts of Port Macquarie and Coffs Harbour. In Sydney he worked at Concord, Royal Prince Alfred, Fairfield and Liverpool hospitals. He then completed his orthopaedic trauma training at NSW’s two busiest units, John Hunter Hospital and Liverpool Hospital.

After attaining specialist qualifications and obtaining his FRACS (Orth), Dr Randhawa pursued further fellowship training in complex hip and knee arthroplasty and orthopaedic trauma at St Vincent’s Hospitals in Sydney. He was then selected for the highly-sought-after hip arthroscopy and anterior hip replacement fellowship in Melbourne under A/Prof John O’Donnell, President of the International Society of Hip Arthroscopy. At this time he mastered the techniques used to manage sports hip conditions such as femoro-acetabular impingement, ligamentum teres and labral tears, gluteal tendinopathy and hip replacement in the younger adult.


A/Prof Sumit Raniga

Shoulder and Elbow Specialist

Available at: Wahroonga

Associate Professor Sumit Raniga is a subspecialist orthopaedic shoulder and elbow surgeon with three years of dedicated clinical and research fellowships in world-renowned centres of excellence in shoulder and elbow surgery. He is an outstanding communicator who is trained to provide the highest standard of evidence-based treatment of shoulder and elbow problems with compassion and empathy. His world-class training allows him to offer his patients contemporary knowledge and technical expertise of the highest standard with a patient centred approach. He specialises in both open and arthroscopic (keyhole) shoulder and elbow reconstruction and joint replacement surgery.



For information on how to book an appointment, please visit our contact page.