Skip Navigation
Search Menu
Find an Expert


Photo of Dr. Mary Johnston

Deirdre Johnston, M.B.B.Ch., M.D.

Mary C Johnston, M.B.B.Ch., M.D.
Assistant Professor of Psychiatry and Behavioral Sciences


Appointment Phone


Main Location

The Johns Hopkins Hospital

Out-of-State & International Patients +
Out of State Patients

Call 410-464-6641 (8a.m. to 6p.m., EST, Mon-Fri)

Learn more about our out-of-state patient services »

International Patients

Call +1-410-502-7683 (7a.m. to 6p.m., EST, Mon-Fri)

Learn more about our international patient services »


  • Assistant Professor of Psychiatry and Behavioral Sciences



The Johns Hopkins Hospital

Appointment Phone: 410-955-6158

600 N. Wolfe Street
Sheikh Zayed Tower
Baltimore, MD 21287 map
Phone: 410-955-6158


Adult Psychiatry , Forensic Psychiatry, Geriatric Psychiatry , Memory Disorders, Psychiatry, Psychiatry and Behavioral Sciences

Research Interests

Memory Disorders; Aging in Place; Outreach mental health care for homebound elders


Dr. Johnston is is co-investigator of MIND at Home, a study measuring the effectiveness of pro-active care coordination to persons with memory disorders at home. In 2008, the American Association for Geriatric Psychiatry created the AAGP Deirdre Johnston Award for Excellence and Innovation in Geriatric Mental Health Outreach Services, to encourage programs providing mental health services to the frail elderly in their homes.
Dr Johnston''s previous appointment was at Wake Forest University School of Medicine, where she was the inaugural Director of the Kate Mills Snider Geriatric Psychiatry Outreach Program (the GO Program), an innovative model of collaborative in-home mental health care for the frail elderly. The GO Program and the Deirdre Johnston award were made possible by generous gifts from the Snider family of Salisbury NC and New York, in honor of their mother, Kate Mills Snider, in gratitude for Dr Johnstons care of Mrs. Snider.
Dr Johnston holds specialty qualifications in psychiatry in the UK and in Canada as well as in the United States and is certified by the American Board of Psychiatry and Neurology in both Geriatric Psychiatry and Forensic Psychiatry. more

    Additional Information

  • Education +


    • University College Hospital / MD (1979)


    • University College Hospital / Psychiatry (1985)
    • University of Alberta-Falculty of Medicine & Dentistry / Psychiatry (1989)


    • American Board of Psychiatry & Neurology / Psychiatry (1992)
  • Research & Publications +

    Selected Publications

    1. Johnston D: A series of cases of dementia presenting with posttraumatic stress disorder symptoms in WWII combat veterans, Journal of the American Geriatrics Society; 48:70-72. 2000.
    2. Johnston, D and Reifler, BV: The organization and provision of Geriatric Psychiatry Services for the Elderly. In The New Oxford Textbook of Psychiatry, Oxford University Press, 2000.
    3. Johnston D, Jones BN 3rd. Telepsychiatry consultations to a rural nursing facility: A two year experience. Journal of Geriatric Psychiatry and Neurology, 14(2):72-5, 2001.
    4. Jones BN 3rd, Johnston D., Reboussin B, McCall WV. Reliability of telepsychiatry assessments: Subjective versus observational ratings. Journal of Geriatric Psychiatry and Neurology, 14(2):66-71, 2001.
    5. Johnston D, Eitel D, McCall, W.V. Electroconvulsive Therapy (ECT): An Introduction for Elderlaw Professionals. Elder's Advisor: The Journal of Elder Law and Retirement Planning, 4(1):18-27, 2002.
    6. Rosenberg P, Johnston D, Lyketsos CG. A clinical approach to mild cognitive impairment. Am J Psychiatry 163:11, Nov 2006.
    7. Johnston, D: Anxiolytics and Neuroloptics in Psychiatric Aspects of Neurologic Diseases: Practical Approaches to Patient Care, eds Constantine Lyketsos, Philip Slavney, Peter Rabins, and John Lipsey. Oxford University Press, in press.
  • Academic Affiliations & Courses +
  • Activities & Honors +
  • Videos & Media +
Is This You? Edit Profile