Dr Ari G. Chacko is the Director, Neurosciences at Apollo Proton Cancer Centre, Chennai. Dr Chacko has 30 years of experience in Neurosurgery and has concentrated on clinical neurosurgery with a focus on microsurgical removal of brain and spinal cord tumours as well as endoscopic removal of skull base tumours including pituitary adenomas. He is a pioneer in the refinement of awake surgeries for gliomas, microsurgical excision of intramedullary spinal cord tumours, vestibular schwannoma surgery for facial nerve preservation and in the maximal safe resection of craniopharyngiomas. He also has considerable experience in surgery for epilepsy including disconnection procedures such as the hemispherectomy for intractable hemispheric epilepsy.