Rochester, Minnesota


jduffy@mayo.edu Clinical Profile


The research interests of Joseph R. Duffy, Ph.D., include neurologic motor speech disorders (the dysarthrias and apraxia of speech), acquired language disorders (aphasia) and acquired psychogenic speech disturbances. The primary focus of his research has been on defining the distinguishing clinical characteristics of these neurologic disorders, establishing their neurologic correlates and refining their differential diagnosis.

Focus areas

  • Defining the distinguishing speech and language characteristics and neuroimaging correlates of primary progressive apraxia of speech and the major variants of primary progressive aphasia

Significance to patient care

Dr. Duffy's research will contribute to more accurate clinical diagnosis of these conditions and the ability to predict their neurological localization and underlying disease process. This will have implications for early identification of certain acquired neurological diseases and their early medical treatment when effective treatments become available.


See my publications


Administrative Appointment

  1. Emeritus, Department of Neurology

Academic Rank

  1. Professor of Speech Pathology


  1. Fellow - Speech Pathology Mayo Clinic in Rochester
  2. PhD - Thesis: Comparison of Brain Injured and Non-Brain-Injured Subjects on an Objective Test of Manual Apraxia University of Connecticut
  3. MA - Thesis: The Effect of Word Predictability on Sentence Intelligibility University of Connecticut
  4. BA Montclair State College

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