Dr O’Riordan is a Consultant Neurologist with a subspecialist interest in multiple sclerosis at BMI Fernbrae Hospital and NHS Tayside where he is Clinical Leader for Neurology and Neurophysiology. In addition he is Director of the Tayside MS Research Unit. He qualified in Dublin where he spent 2 years as a Neurological Registrar. He subsequently became a Research Fellow at The Institute of Neurology, Queen Square, London where he trained with Prof Ian McDonald and Prof David Miller. His research was in the application of magnetic resonance imaging as a prognostic indicator and surrogate markers in inflammatory demyelinating diseases of the central nervous system particularly multiple sclerosis, Devic's neuromyelitis optica and Acute Dessimmated Encephalomyelitis. His most significant work was in clinically isolated syndromes. Dr O’Riordan subsequently completed his training in various London Hospitals - St Thomas, Guy's and St Mary's Hospitals before returning to the National Hospital, Queen Square.
He has been in his present post since June 1999. His current role is clinical, managerial and research. Hi research involves clinical trial work: he has participated in over 20 clinical trials in the field of multiple sclerosis both on a commercial and non commercial basis. Dr O’Riordan is currently participating in clinical trials involving the following: Fingolimod, Teriflunomide, Betaseron and Avonex. He is also looking at the epidemiology of Multiple Sclerosis - Chlamydia Pneumoniae and Vitamin D, and sits on the National Steering Group for the Scottish MS Register.