Dr. Xavier Montalban is an internationally recognized neurologist who is considered a key opinion leader within the field of multiple sclerosis (MS). Dr. Montalban has held diverse leadership positions and is currently a Professor of Medicine and Director of the Neurology Department at the University of Toronto. He also serves as Chair of the Department of Neurology-Neuroimmunology and Director of the Multiple Sclerosis Centre of Catalonia at the Vall d’Hebron University Hospital in Barcelona, Spain. The Multiple Sclerosis Centre of Catalonia, or Cemcat, is accredited as a national flagship service for the MS care process within the context of the Flagship Centres, Units, and Services programme of the Spanish Ministry of Health. Dr. Montalban is a former president of the European Committee for Treatment and Research in Multiple Sclerosis (ECTRIMS) and recently co-directed the development of the first Multiple Sclerosis Treatment Guidelines for ECTRIMS and the European Academy of Neurology. He has contributed more than 500 publications and several book chapters to the academic arena, served on multiple steering committees of clinical trials related to multiple sclerosis, and is a valued member of the International Panel on Multiple Sclerosis Diagnostic Criteria and Clinical Trials. With more than 25 years of research, Dr. Montalban continues to strive to discover more effective therapies for patients with MS and has brought paradigm shifts to the way we understand and treat MS.