Michael J. Aminoff, MD, DSc, FRCP (San Francisco, CA) is Professor and Executive Vice-Chair,Department of Neurology, University of California School of Medicine, San Francisco.David A. Greenberg, MD, PhD (Novato, CA) is Professor and Vice-President for Special Research Programs, Buck Institute for Age Research.Roger P. Simon, MD (Portland, OR) is Robert Stone Dow Chair of Neurology,Director of Neurobiology Research, Legacy Health Systems.