Agadha graduated in Medicine from the University of Otago in 1986. Agadha is a long serving member of the Wellington Neurosurgery team having started here as a house surgeon in 1987. He has been a neurosurgeon at Wellington Hospital since 2000. He trained as an academic neurosurgeon undertaking research into the biology of brain tumours in Melbourne for which he was awarded his MD from the University of Melbourne in 2005. He completed his neurosurgical training in Auckland (1991-1994) and Melbourne (1995-1998) and undertook a Fellowship at the Cleveland Clinic Foundation in the USA in 1999. Agadha is a former Clinical Director of Neurosurgery and Supervisor of Neurosurgical Training at Wellington Hospital and continues his research interests. Agadha is a Research Fellow at the Gillies McIndoe Research Institute, and is a former Senior Lecturer at the University of Otago Medical School in Wellington. Agadha has an interest in neurovascular surgery, neuro-oncology, anterior and posterior skull base neurosurgery, spinal neurosurgery and craniofacial surgery. Agadha collaborates with Simon Robinson, Otorlaryngolist, to undertake endoscopic pituitary surgery and extended complex anterior skull base surgery. Agadha collaborates with Mr Charles Davis, plastic surgeon, in offering a combined craniofacial service for Central and Southern New Zealand. Agadha undertakes voluntary surgery in Sri Lanka to help children with craniofacial conditions.