Clinical Instructor in Dentistry, Department of Clinical Dentistry University of Rochester, Strong Memorial Hospital, 1983-1986.
Diplomate, American Board of Oral and Maxillofacial Surgeons, 1988.
Assistant Professor, Department of Oral and Maxillofacial Surgery. UNC, School of Dentistry, 1986-1993.
Associate Professor, Permanent Tenure, Department of Oral and Maxillofacial Surgery. UNC, School of Dentistry, 1993-1998.
Professor, Department of Oral and Maxillofacial Surgery. UNC, School of Dentistry, 1998-2005.
Professor, Physical Medicine Institute. University of North Texas Health Sciences Center at Fort Worth, 2010-2014.
Professor, secondary appointment. Department of Neurology and Neurotherapeutics. University of Texas Southwestern Medical Center, Dallas, Texas, 2014 to present.
Graduate Program Director, Department of Oral and Maxillofacial Surgery. UNC, School of Dentistry, 1992-2005.
Co-Director, Oral and Maxillofacial Pain Program. UNC, School of Dentistry, 1995-2005.
Professor and Chairman, Division of Oral and Maxillofacial Surgery. Department of Surgery. UT Southwestern Medical Center, Dallas, Texas, 2006-Present
Clinical Instructor in Dentistry, Department of Clinical Dentistry University of Rochester, Strong Memorial Hospital, 1983-1986.
Diplomate, American Board of Oral and Maxillofacial Surgeons, 1988.
Assistant Professor, Department of Oral and Maxillofacial Surgery. UNC, School of Dentistry, 1986-1993.
Associate Professor, Permanent Tenure, Department of Oral and Maxillofacial Surgery. UNC, School of Dentistry, 1993-1998.
Professor, Department of Oral and Maxillofacial Surgery. UNC, School of Dentistry, 1998-2005.
Professor, Physical Medicine Institute. University of North Texas Health Sciences Center at Fort Worth, 2010-2014.
Professor, secondary appointment. Department of Neurology and Neurotherapeutics. University of Texas Southwestern Medical Center, Dallas, Texas, 2014 to present.
Graduate Program Director, Department of Oral and Maxillofacial Surgery. UNC, School of Dentistry, 1992-2005.
Co-Director, Oral and Maxillofacial Pain Program. UNC, School of Dentistry, 1995-2005.
Professor and Chairman, Division of Oral and Maxillofacial Surgery. Department of Surgery. UT Southwestern Medical Center, Dallas, Texas, 2006-Present