Archives: Team

Owase is the lead neurosurgeon for the successful separation of 8 sets of Craniopagus twins between 2011 and 2025. This constitutes the largest global experience of such cases.

He is a Professor of Paediatric Neurosurgery at University College London and Great Ormond Street Hospital for Children (GOSH) and has worked there since 2000. He was the Head of Department of Neurosurgery from 2012-2018 and is currently the Head of Department of Craniofacial Surgery. Owase’s specialist areas of  interest are craniopagus twins, craniofacial surgery, neuro-oncology and CSF and ICP pathologies.

Besides his surgical degrees, he holds an MPhil in Medical Law from the University of Glasgow and an MBA from INSEAD. He is a director of the FaceValue research programme at UCL ICH, with a research focus of engineering and AI prediction modelling to design bespoke cranial implants and make surgery safer and more effective. He is the inventor of CranioExpand^TM, a bespoke internal cranial distractor system.

Owase was named in ‘The Times’ top 100 surgeons in the UK in 2011 and the top 100 children’s doctors in 2012 and was awarded an MBE for services to paediatric neurosurgery and global child health in the Kings Birthday Honours List in 2025.

Andrew Savile is a lawyer and former partner of Mishcon de Reya LLP, who advises individuals, families and family offices on a wide range of areas affecting their businesses and their personal affairs. Andrew also advises a number of charitable and philanthropic entities which operate worldwide. Andrew has been a trustee of Gemini Untwined since its formation in 2019.

Bernard Hogan-Howe, QPM is a former police officer and was the head of London’s Metropolitan Police as Commissioner of Police of the Metropolis – from 2011 until 2017. Bernard Hogan-Howe is now a current member of the House of Lords and works closely with a number of charities including St Giles Trust and Gemini Untwined.

Kamal Rahman is a Partner and lawyer at Mishcon de Reya, trusted advisor to many clients seeking to internationalise their family and wealth. Kamal has an international HNW client base which allows her to bring philanthropic causes to the attention of potential donors. Kamal’s expertise, in synergy with her strong family values and considerable cross-cultural experience led to the co-founding of Gemini Untwined and its continuous growth henceforth.

Professor Richard Hayward was a founding member of the multidisciplinary craniofacial unit at Great Ormond Street Hospital, the largest in the UK. He has been involved in the separation of three pairs of craniopagus twins. He presently supervises a variety of paediatric neurosurgical and craniofacial research projects.

Edward Kiely is a Paediatric Surgeon formerly based at Great Ormond Street Children’s Hospital (GOSH) in London, from 1983 till 2016. He is best known for the surgery of neuroblastoma and for the separation of conjoined twins. During his career he was involved in the assessment of 40 pairs of conjoint twins and the surgical separation of 27 pairs.

CBE FDSRCS FRCS (Plast)

Professor David Dunaway was the lead craniofacial surgeon for the successful separation of the 3 sets of Craniopagus twins in 2006, 2011 and 2019.

In July of 2000, he joined the Plastic Surgery and Craniofacial Unit at Great Ormond Street Hospital for Children, where he now leads the Craniofacial Service. He is a member of the Adult Craniofacial Service based at University College London Hospital and the Eastman Dental Hospital.

David is also Professor of Craniofacial surgery at the UCL Institute of Child Health, where his research interests include the study of congenital facial deformity, craniosynostosis, three dimensional facial imaging and craniofacial distraction devices.

In 2016, David received a CBE in the Queen’s Birthday Honours list for services to facial surgery.

Specialising in Craniomaxillofacial Surgery, with national and international training in Aesthetic and Restorative Plastic Surgery, Paediatric Plastic and Craniofacial Surgery.

Juling Ong is a craniofacial and paediatric plastic surgeon at Great Ormond Street Hospital for Children in London. He trained in plastic surgery in London, and went on to undertake a craniofacial and paediatric plastic surgery training fellowship in the United States.

Neil is a Consultant Plastic Surgeon and the Lead Clinician for the Department of Plastic and Reconstructive Surgery at GOSH and Honorary Associate Professor at GOSH-ICH. He was part of the team which separated the first of the craniopagus twins and also twins joined at the chest abdomen and limbs.

Mr Zubair Tahir is an experienced consultant paediatric neurosurgeon, who is passionate about delivering the highest quality care to all children. He works as a consultant at Great Ormond Street hospital (GOSH) and Associate Professor at the UCL Institute of Child Health, London, UK.

Dr Bridget Callaghan has been a Consultant General Paediatrician for twelve years and works in the International Division at Great Ormond Street Hospital.  Dr Callaghan has been the General Paediatrician for two sets of Craniopagus twins, before and after separation and has considerable expertise in managing their complex physiologies in an holistic way. She also is expert in supporting parents and families and the wider multidisciplinary team through the challenging jouney of separation.

Dr Felice D’Arco is a Consultant Paediatric Neuroradiologist at GOSH. His specialisms include: Inner ear malformations, Paediatric head and neck radiology, Paediatric brain tumours and Epilepsy.

Dr Ong has been a consultant paediatric anaesthetist at Great Ormond Street Hospital since 2006 and has a special interest in anaesthesia for craniofacial surgery and the paediatric difficult airway.