Jeffrey A. Cohen MD is Director of the Experimental TherapeuJeffrey A. Cohen MD is Director of the Experimental Therapeutics Program at the Mellen Center for Multiple Sclerosis Tretics Program at the Mellen Center for Multiple Sclerosis Treatment and Research, Department of Neurology, Neurological Iatment and Research, Department of Neurology, Neurological Institute, Cleveland Clinic, Cleveland, OH, USA. nstitute, Cleveland Clinic, Cleveland, OH, USA.